JEE Main 2019 — Algebra

Let ${a}_{1}, {a}_{2}, \ldots , {a}_{30}$ be an A.P., $S= \sum _{i=1}^{30}{a}_{i}$ and $T= \sum _{i=1}^{15}{a}_{(2i-1)}.$ If ${a}_{5}=27$ and $S-2T=75,$ then ${a}_{10}$ is equal to:

If ${a}_{1},{a}_{2},{a}_{3},....$ are in A.P. such that ${a}_{1}+{a}_{7}+{a}_{16}=40,$ then the sum of the first $15$ terms of this A.P is:

The number of integral values of $m$ for which the quadratic expression $(1+2m) {x}^{2}-2(1+3m)x+4(1+m), x\in R$ is always positive, is

Let $\alpha$ and $\beta$ be the roots of the equation ${x}^{2}+x+1=0.$ Then for $y\neq 0$ in $R,|\begin{matrix}y+1 & \alpha & \beta \\ \alpha & y+\beta & 1 \\ \beta & 1 & y+\alpha \end{matrix}|$ is equal to

The total number of matrices $A=(\begin{matrix}0 & 2y & 1 \\ 2x & y & -1 \\ 2x & -y & 1\end{matrix}),(x,y\in R,x\neq y)$ for which ${A}^{T}A=3{I}_{3}$ is:

If $A=[\begin{matrix}cos\theta & -sin\theta \\ sin\theta & cos\theta \end{matrix}]$ , then the matrix ${A}^{-50}$ when $\theta =\frac{\pi }{12},$ is equal to:

If three distinct numbers $a, b, c$ are in G.P. and the equations $a{x}^{2}+2bx+c=0$ and $d{x}^{2}+2ex+f=0$ have a common root, then which one of the following statements is correct?

If $B=[\begin{matrix}5 & 2\alpha & 1 \\ 0 & 2 & 1 \\ \alpha & 3 & -1\end{matrix}]$ is the inverse of a $3\times 3$ matix $A,$ then the sum of all values of $\alpha$ for which $det(A)+1=0,$ is:

The smallest natural number $n$ , such that the coefficient of $x$ in the expansion of ${({x}^{2}+\frac{1}{{x}^{3}})}^{n}$ is $C23 n$ , is

If the fourth term in the binomial expansion of ${(\sqrt{{x}^{\frac{1}{1+{log}_{10}x}}}+{x}^{\frac{1}{12}})}^{6}$ is equal to $200,$ and $x>1,$ then the value of $x$ is

Let $A=[\begin{matrix}\mathrm{cos}\alpha & -\mathrm{sin}\alpha \\ \mathrm{sin}\alpha & \mathrm{cos}\alpha \end{matrix}],(a\in R)$ such that ${A}^{32}=[\begin{matrix}0 & -1 \\ 1 & 0\end{matrix}].$ Then, a value of $\alpha$ is:

Let $A=[\begin{matrix}2 & b & 1 \\ b & {b}^{2}+1 & b \\ 1 & b & 2\end{matrix}],$ where $b>0$. Then the minimum value of $\frac{\mathrm{det}(A)}{b}$ is:

Let the numbers $2, b, c$ be in an A.P. and $A=[\begin{matrix}1 & 1 & 1 \\ 2 & b & c \\ 4 & {b}^{2} & {c}^{2}\end{matrix}]$ . If $det(A) \in [2,16],$ then $c$ lies in the interval:

Let ${z}_{1}$ and ${z}_{2}$ be any two non-zero complex numbers such that $3|{z}_{1}|=4|{z}_{2}|.$ If $z=\frac{3{z}_{1}}{2{z}_{2}}+\frac{2{z}_{2}}{3{z}_{1}}$ then maximum value of $|z|$ is Note: In actual paper value of $|z|$ was asked. Hence, none of the options given were correct. So we have modified the question as well as options.

Let ${z}_{1}$ and ${z}_{2}$ be two complex numbers satisfying $|{z}_{1}|=9$ and $|{z}_{2}-3-4i|=4$. Then the minimum value of $|{z}_{1}-{z}_{2}|$ is :

Let ${a}_{1}, {a}_{2}, {a}_{3}\ldots ,{a}_{10}$ be in $G.P.$with ${a}_{i}>0$ for $i=1, 2, \ldots , 10$ and $S$ be the set of pairs $(r, k), r, k\in N$ (the set of natural numbers) for which $|\begin{matrix}{\mathrm{log}}_{e}⁡{a}_{1}^{r} {a}_{2}^{k} & {\mathrm{log}}_{e}⁡{a}_{2}^{r}{a}_{3}^{k} & {\mathrm{log}}_{e}⁡{a}_{3}^{r}{a}_{4}^{k} \\ {\mathrm{log}}_{e}⁡{a}_{4}^{r} {a}_{5}^{k} & {\mathrm{log}}_{e}⁡{a}_{5}^{r}{a}_{6}^{k} & {\mathrm{log}}_{e}⁡{a}_{6}^{r}{a}_{7}^{k} \\ {\mathrm{log}}_{e}⁡{a}_{7}^{r}{a}_{8}^{k} & {\mathrm{log}}_{e}⁡{a}_{8}^{r}{a}_{9}^{k} & {\mathrm{log}}_{e}⁡{a}_{9}^{r}{a}_{10}^{k}\end{matrix}|=0$ Then the number of elements in $S,$ is:

A value of $\theta \in (0,\frac{\pi }{3}),$ for which $|\begin{matrix}1+{cos}^{2}\theta & {sin}^{2}\theta & 4 cos6\theta \\ {cos}^{2}\theta & 1+{sin}^{2}\theta & 4 cos6\theta \\ {cos}^{2}\theta & {sin}^{2}\theta & 1+4 cos6\theta \end{matrix}|=0,$ is

If $\alpha ,\beta$ and $\gamma$ are three consecutive terms of a non-constant G.P. Such that the equations $\alpha {x}^{2}+2\beta x+\gamma =0$ and ${x}^{2}+x-1=0$ have a common root, then $\alpha (\beta +\gamma )$ is equal to:

The set of all values of $\lambda$ for which the system of linear equations $x-2y-2z=\lambda x$ $x+2y+z=\lambda y$ $-x-y=\lambda z$ has a non-trivial solution :

If the system of linear equations $x-2y+kz=1$ $2x+y+z=2$ $3x-y-kz=3$ has a solution $(x,y,z),z\neq 0,$ then $(x,y)$ lies on the straight line whose equation is:

If $A=[\begin{matrix}{e}^{t} & {e}^{-t}cos t & {e}^{-t}\mathrm{sin}⁡ t \\ {e}^{t} & -{e}^{-t}\mathrm{cos}⁡t-{e}^{-t}\mathrm{sin}⁡t & -{e}^{-t}\mathrm{sin}⁡t+{e}^{-t}\mathrm{cos}⁡t \\ {e}^{t} & {2e}^{-t}\mathrm{sin}⁡t & -2{e}^{-t}\mathrm{cos}⁡t\end{matrix}],$ then $A$ is:

If $\left|\begin{array}{ccc}a-b-c & 2 a & 2 a \\ 2 b & b-c-a & 2 b \\ 2 c & 2 c & c-a-b\end{array}\right|$ $=(a+b+c)(x+a+b+c)^{2}, x \neq 0$ and $a+b+c \neq 0,$ then $x$ is equal to

An ordered pair $(\alpha , \beta )$ for which the system of linear equations $(1+\alpha )x+\beta y+z=2$ $\alpha x+(1+\beta )y+z=3$ $\alpha x+\beta y+2z=2$ has a unique solution, is :

If the system of equations $2x+3y-z=0, x+ky-2z=0$ and $2x-y+z=0$ has a non-trivial solution $(x,y,z),$ then $\frac{x}{y}+\frac{y}{z}+\frac{z}{x}+k$ is equal to

If the system of equations $x+y+z=5,$ $x+2y+3z=9,$ $x+3y+\alpha z=\beta$ has inifinitely many solutions, then $\beta -\alpha$ equals

If some three consecutive coefficients in the binomial expansion of ${(x+1)}^{n}$ in powers of $x$ are in the ratio $2:15:70,$ then the average of these three coefficients is:

Let $z\in C$ be such that $|z|<1.$ If $\omega =\frac{5+3z}{5(1-z)},$ then:

Let $A=$ { $x\in R:x$ is not a positive integer} $.$ Define a function $f:A\rightarrow R$ as $f(x)=\frac{2x}{x-1}$ , then $f$ is:

The coefficient of ${x}^{18}$ in the product $(1+x){(1-x)}^{10}{(1+x+{x}^{2})}^{9}$ is

The number of real roots of the equation $5+|{2}^{x}-1|={2}^{x}({2}^{x}-2)$ is :

Let $p, q\in Q .$ If $2-\sqrt{3}$ is a root of the quadratic equation ${x}^{2}+px+q=0,$ then

If the system of linear equations $2 x+2 y+3 z=a$ $3 x-y+5 z=b$ $x-3 y+2 z=c$ where, $a, b,$ care non-zero real numbers, has more than onc solution, then

If the fourth term in the Binomial expansion of ${(\frac{2}{x}+{x}^{{log}_{8}x})}^{6},(x>0)$ is $20\times {8}^{7},$ then a value of $x$ is

If $5, 5r, 5{r}^{2}$ are the lengths of the sides of a triangle, then $r$ can not be equal to:

The value of $\lambda$ such that sum of the squares of the roots of the quadratic equation, ${x}^{2}+(3-\lambda ) x+2=\lambda$ has the least value is:

If the system of linear equations $x+y+z=5$, $x+2y+2z=6$, $x+3y+\lambda z=\mu , (\lambda , \mu \in R)$ , has infinitely many solutions, then the value of $\lambda +\mu$ is:

Let $a,b$ and $c$ be in $G.P.$ with common ratio $r,$ where $a\neq 0$ and $0<r\leq \frac{1}{2}.$ If $3a,7b$ and $15c$ are the first three terms of an $A.P.,$ then the ${4}^{th}$ term of this $A.P.$ is :

The number of natural numbers less than $7000$ which can be formed by using the digits $0, 1, 3, 7, 9$ (repetition of digits allowed) is equal to:

If $\lambda$ be the ratio of the roots of the quadratic equation in $x, 3{m}^{2}{x}^{2}+m(m-4)x+2=0$, then the least value of $m$ for which $\lambda +\frac{1}{\lambda }=1$, is :

For $x\in R-{0, 1},$ let ${f}_{1}(x)=\frac{1}{x},{f}_{2}(x)=1-x$ and ${f}_{3}(x)=\frac{1}{1-x}$ be three given functions. If a function, $J(x)$ satisfies $({f}_{2}oJo{f}_{1})(x)={f}_{3}(x)$ then $J(x)$ is equal to:

Let $N$ be the set of natural numbers and two functions $f$ and $g$ be defined as $f,g:N\rightarrow N$ such that $f(n)={\begin{matrix}\frac{n+1}{2}, if n is odd \\ \frac{n}{2}, if n is even\end{matrix}$ and $g(n)=n-{(-1)}^{n}.$ Then $fog$ is:

If $\alpha$ and $\beta$ are the roots of the quadratic equation ${x}^{2}+xsin\theta -2sin\theta =0, \theta \in (0,\frac{\pi }{2})$ , then $\frac{{\alpha }^{12}+{\beta }^{12}}{({\alpha }^{-12}+{\beta }^{-12}){.(\alpha -\beta )}^{24}}$ is equal to :

If the third term in the binomial expansion of ${(1+{x}^{{\mathrm{log}}_{2}x})}^{5}$ equals $2560,$ then a possible value of $x$ is

Let $Z$ be the set of integers. If $A={x\in Z :{2}^{(x+2)({x}^{2}-5x+6)}=1}$ and $B={x\in Z :- 3< 2x-1<9}$, then the number of subsets of the set $A\times B$, is :

If $f(x)={\mathrm{log}}_{e}(\frac{1-x}{1+x}), |x|< 1,$ then $f(\frac{2x}{1+{x}^{2}})$ is equal to

Let $z$ be a complex number such that $|z|+z=3+i$ $($ where $i=\sqrt{-1})$ Then $|\mathrm{z}|$ is equal to :

The number of functions $f$ from $\{1,2,3, \ldots, 20\}$ onto $\{1,2,3, \ldots, 20\}$ such that $f(k)$ is a multiple of $3,$ whenever $k$ is a multiple of 4 is:

Let a function $f:(0, \infty) \rightarrow(0, \infty)$ be defined by $f(x)=\left|1-\frac{1}{x}\right| .$ Then $f$ is :

If ${}^{n}{C}_{4},{ }^{n}{C}_{5}$ and ${}^{n}{C}_{6}$ are in A.P., then $n$ can be

If both the roots of the quadratic equation ${x}^{2}-mx+4=0$ are real and distinct and they lie in the interval $(1, 5),$ then $m$ lies in the interval: Note: In the actual JEE paper interval was $[1, 5]$

If $[\begin{matrix}1 & 1 \\ 0 & 1\end{matrix}][\begin{matrix}1 & 2 \\ 0 & 1\end{matrix}][\begin{matrix}1 & 3 \\ 0 & 1\end{matrix}]\ldots .[\begin{matrix}1 & n-1 \\ 0 & 1\end{matrix}]=[\begin{matrix}1 & 78 \\ 0 & 1\end{matrix}],$ then the inverse of $[\begin{matrix}1 & n \\ 0 & 1\end{matrix}]$ is:

The sum of the solutions of the equation $|\sqrt{x}-2|+\sqrt{x}(\sqrt{x}-4)+2=0,(x>0)$ is equal to

Let $A=\left(\begin{array}{ccc}0 & 2 q & r \\ p & q & -r \\ p & -q & r\end{array}\right)$. If $\mathrm{AA}^{\mathrm{T}}=\mathrm{I}_{3},$ then $|\mathrm{p}|$ is:

Let $d\in R,$ and $A=[\begin{matrix}-2 & 4+d & (\mathrm{sin}\theta )-2 \\ 1 & (\mathrm{sin}\theta )+2 & d \\ 5 & (2\mathrm{sin}\theta )-d & (-\mathrm{sin}\theta )+2+2d\end{matrix}],$ $\theta \in [0, 2\pi ].$ If the minimum value of $det(A)$ is $8,$ then a value of $d$ is:

The number of integral values of $m$ for which the equation, $(1+{m}^{2}){x}^{2}-2(1+3m)x+(1+8m)=0$ has no real root, is

The system of linear equations $x+y+z=2$ $2x+3y+2z=5$ $2x+3y+({a}^{2}-1)z=a+1$

Consider the quadratic equation $(c-5){x}^{2}-2cx+(c-4)=0,c\neq 5.$ Let $S$ be the set of all integral values of $c$ for which one root of the equation lies in the interval $(0, 2)$ and its other root lies in the interval $(2, 3).$ Then the number of elements in $S$ is

If $m$ is chosen in the quadratic equation $({m}^{2}+1){x}^{2}-3x+{({m}^{2}+1)}^{2}=0$ such that the sum of its roots is greatest, then the absolute difference of the cubes of its roots is:

The number of all possible positive integral value of $\alpha$ for which the roots of the quadratic equation $6{x}^{2}-11x+\alpha =0$ are rational numbers is:

Let $\alpha$ and $\beta$ be the roots of the equation ${x}^{2}+2x+2=0,$ then ${\alpha }^{15}+{\beta }^{15}$ is equal to

If $z$ and $\omega$ are two complex numbers such that $|z\omega |=1$ and $arg(z)-arg(\omega )=\frac{\pi }{2}$, then:

All the points in the set $S={\frac{\alpha +i}{\alpha -i},\alpha \in R},i=\sqrt{-1}$ lie on a

Let the sum of the first $n$ terms of a non-constant $A.P.,{a}_{1},{a}_{2},{a}_{3},....,{a}_{n}$ be $50n+\frac{n(n-7)}{2}A,$ where $A$ is a constant. If $d$ is the common difference of this $A.P.$, then the ordered pair $(d,{a}_{50})$ is equal to

The number of four-digit numbers strictly greater than $4321$ that can be formed using the digit $0,1,2,3,4,5$ (repetition of digits is allowed) is:

Consider a class of $5$ girls and $7$ boys. The number of different teams consisting of $2$ girls and $3$ boys that can be formed from this class, if there are two specific boys $A$ and $B,$ who refuse to be the members of the same team, is:

Let $f(x)={\mathrm{log}}_{e}(sinx), (0<x<\pi )$ and $g(x)={\mathrm{sin}}^{-1}({e}^{-x}), (x\geq 0).$ If $\alpha$ is a positive real number such that $a={(fog)}^{'}(\alpha )$ and $b=(fog)(\alpha ),$ then

Let ${S}_{n}$ denote the sum of the first $n$ terms of an $A.P.$. If ${S}_{4}=16$ and ${S}_{6}=-48$ , then ${S}_{10}$ is equal to:

If $si{n}^{4}\alpha +4co{s}^{4}\beta +2=4\sqrt{2}sin\alpha cos\beta$, $\alpha ,\beta \in [0,\pi ]$, then $cos(\alpha +\beta )-cos(\alpha -\beta )$ is equal to

The sum of the following series $1+6+\frac{9({1}^{2}+{2}^{2}+{3}^{2})}{7}+\frac{12({1}^{2}+{2}^{2}+{3}^{2}+{4}^{2})}{9}+\frac{15({1}^{2}+{2}^{2}+\ldots +{5}^{2})}{11}+....$ up to $15$ terms, is:

A group of students comprises of $5$ boys and n girls. If the number of ways, in which a team of $3$ students can randomly be selected from this group such that there is at least one boy and at least one girl in each team, is $1750,$ then n is equal to

If the coefficients of ${x}^{2}$ and ${x}^{3}$, are both zero, in the expansion of the expression $(1+ax+b{x}^{2}){(1-3x)}^{15}$, in powers of $x$ , then the ordered pair $(a,b)$ is equal to

The total number of irrational terms in the binomial expansion of ${({7}^{\frac{1}{5}}-{3}^{\frac{1}{10}})}^{60}$ is

The sum of the series $1+2\times 3+3\times 5+4\times 7+\ldots$ upto ${11}^{th}$ term is:

In a class of $140$ students numbered $1$ to$140$ , all even numbered students opted Mathematics course, those whose number is divisible by $3$ opted Physics course and those whose number is divisible by $5$ opted Chemistry course. Then the number of students who did not opt for any of the three courses is:

If $a, b$ and $c$ be three distinct real numbers in G.P. and $a+b+c=xb,$ then $x$ cannot be:

If the system of linear equations $x-4y+7z=g$; $3y-5z=h$; $-2x+5y-9z=k$ is consistent, then:

If the sum and product of the first three terms in an $A.P.$ are $33$ and $1155$, respectively, then a value of its ${11}^{th}$ term is:

Let $P=[\begin{matrix}1 & 0 & 0 \\ 3 & 1 & 0 \\ 9 & 3 & 1\end{matrix}]$ and $Q=[{q}_{ij}]$ be two $3\times 3$ matrices such that $Q-{P}^{5}={I}_{3}$. Then $\frac{{q}_{21}+{q}_{31}}{{q}_{32}}$ is equal to :

Let $\lambda$ be a real number for which the system of linear equations $x+y+z=6,$ $4x+\lambda y-\lambda z=\lambda -2$ and $3x+2y-4z=-5$ has infinitely many solutions. Then $\lambda$ is a root of the quadratic equation:

If $A$ is a symmetric matrix and $B$ is skew- symmetric matrix such that $A+B=[\begin{matrix}2 & 3 \\ 5 & -1\end{matrix}]$ , then $AB$ is equal to:

Let $a_{1}, a_{2}, \ldots, a_{10}$ be a G.P. If $\frac{a_{3}}{a_{1}}=25,$ then $\frac{a_{9}}{a_{5}}$ equals :

The coefficient of ${t}^{4}$ in the expansion of ${(\frac{1-{t}^{6}}{1-t})}^{3}$ is

Let $\alpha$ and $\beta$ be the roots of the quadratic equation $x^{2} \sin \theta-x(\sin \theta \cos \theta+1)+\cos \theta=0\left(0 < \theta < 45^{\circ}\right),$ and $\alpha < \beta .$ Then $\sum_{n=0}^{\infty}\left(\alpha^{n}+\frac{(-1)^{n}}{\beta^{n}}\right)$ is equal to :

The sum of the real values of $x$ for which the middle term in the binomial expansion of $\left(\frac{x^{3}}{3}+\frac{3}{x}\right)^{8}$ equals 5670 is :

If three of the six vertices of a regular hexagon are chosen at random, then the probability that the triangle formed with these chosen vertices is equilateral is:

If $z=\frac{\sqrt{3}}{2}+\frac{i}{2} (i=\sqrt{-1}),$ then ${(1+iz+{z}^{5}+i{z}^{8})}^{9}$ is equal to:

Let ${z}_{0}$ be a root of quadratic equation, ${x}^{2}+x+1=0.$ If $z=3+6i{z}_{0}^{81}-3i{z}_{0}^{93}$ , then $arg$ $(z)$ is equal to:

The term independent of $x$ in the expansion of $(\frac{1}{60}-\frac{{x}^{8}}{81}).{(2{x}^{2}-\frac{3}{{x}^{2}})}^{6}$ is equal to

There are $m$ men and two women participating in a chess tournament. Each participant plays two games with every other participant. If the number of games played by the men between themselves exceeds the number of games played between the men and the women by $84$, then the value of $m$ is :

If $a>0$ and $z=\frac{{(1+i)}^{2}}{a-i}$ , has magnitude $\sqrt{\frac{2}{5}}$ , then $\overset{-}{z}$ is equal to:

Let $S={1, 2, 3,\ldots .,100}$, then number of non-empty subsets $A$ of $S$ such that the product of elements in $A$ is even is :

The sum of an infinite geometric series with positive terms is 3 and the sum of the cubes of its terms is $\frac{27}{19}$. Then the common ratio of this series is:

The Number of ways of choosing $10$ objects out of $31$ objects of which $10$ are identical and the remaining $21$ are distinct, is:

The equation $|z-i|=|z-1|,i=\sqrt{-1},$ represents:

If the fractional part of the number $\frac{{2}^{403}}{15}$ is $\frac{k}{15},$ then $k$ is equal to

If $\alpha$and $\beta$ are the roots of the equation $375 {x}^{2}-25x-2=0,$ then $\underset{n\rightarrow \infty }{lim}\sum _{r=1}^{n}{\alpha }^{r}+\underset{n\rightarrow \infty }{lim}\sum _{r=1}^{n}{\beta }^{r}$ is equal to:

The sum of all two digit positive numbers which when divided by $7$ yield $2$ or $5$ as remainder is

A committee of $11$ member is to be formed from $8$ males and $5$ females. If $m$ is the number of ways the committee is formed with at least $6$ males and $n$ is the number of ways the committee is formed with at least $3$ females, then:

If $\alpha$ and $\beta$ be the roots of the equation ${x}^{2}-2x+2=0,$ then the least value of $n$ for which ${(\frac{\alpha }{\beta })}^{n}=1$ is

Let $f: R \rightarrow R$ be defined by $f(x)=\frac{x}{1+x^{2}}, x \in R .$ Then the range of $f$ is

The domain of the definition of the function $f(x)=\frac{1}{4-{x}^{2}}+{log}_{10}({x}^{3}-x)$ is:

Let $\left(-2-\frac{1}{3} i\right)^{3}=\frac{x+i y}{27}(i=\sqrt{-1}),$ where $x$ and $y$ are real numbers then $\mathrm{y}-\mathrm{x}$ equals

If the sum of the first $15$ terms of the series ${(\frac{3}{4})}^{3}+{(1\frac{1}{2})}^{3}+{(2\frac{1}{4})}^{3}+{3}^{3}+{(3\frac{3}{4})}_{ }^{3}+\ldots$ is equal to $225K$, then $K$ is equal to :

The sum of the real roots of the equation $|\begin{matrix}x & -6 & -1 \\ 2 & -3x & x-3 \\ -3 & 2x & x+2\end{matrix}|=0,$ is equal to:

Let $z={(\frac{\sqrt{3}}{2}+\frac{i}{2})}^{5}+{(\frac{\sqrt{3}}{2}-\frac{i}{2})}^{5}.$ If $R(z)$ and $I(z)$ respectively denote the real and imaginary parts of $z,$ then

If $A=[\begin{matrix}1 & \mathrm{sin}\theta & 1 \\ -\mathrm{sin}\theta & 1 & \mathrm{sin}\theta \\ -1 & -\mathrm{sin}\theta & 1\end{matrix}]$, then for all $\theta \in (\frac{3\pi }{4},\frac{5\pi }{4})$, $\mathrm{det}(A)$ lies in the interval :

All possible numbers are formed using the digits $1, 1, 2, 2, 2, 2, 3, 4, 4$ taken all at a time. The number of such numbers in which the odd digits occupy even places is

If the function $f:R-{1, -1}\rightarrow A$ defined by $f(x)=\frac{{x}^{2}}{1-{x}^{2}},$ is surjective, then $A$ is equal to

Let $A={\theta \in (-\frac{\pi }{2},\pi ):\frac{3+2isin\theta }{1-2i sin\theta } is purely imaginary }.$ Then the sum of the elements in $A$ is:

If 19 th term of a non-zero A.P. is zero, then its (49th term): (29th term) is:

Suppose that $20$ pillars of the same height have been erected along the boundary of circular stadium. If the top of each pillar has been connected by beams with the top of all its non-adjacent pillars, then the total number of beams is:

If ${\Delta }_{1}=|\begin{matrix}x & sin\theta & cos\theta \\ -sin\theta & -x & 1 \\ cos\theta & 1 & x\end{matrix}|$ and ${\Delta }_{2}=|\begin{matrix}x & sin2\theta & cos2\theta \\ -sin2\theta & -x & 1 \\ cos2\theta & 1 & x\end{matrix}|,$ $x\neq 0;$ then for all $\theta \in (0,\frac{\pi }{2})$ :

The number of values of $\theta \in (0, \pi )$ for which the system of linear equations $x+3y+7z=0$ $-x+4y+7z=0$ $(\mathrm{sin}⁡3\theta )x+(\mathrm{cos}⁡2\theta )y+2z=0$ has a non-trivial solution, is:

A ratio of the ${5}^{th}$ term from the beginning to the ${5}^{th}$ term from the end in the binomial expansion of ${({2}^{\frac{1}{3}}+\frac{1}{2{(3)}^{\frac{1}{3}}})}^{10}$ is

Let $A, B$ and $C$ be sets such that $\phi \neq A\cap B\subseteq C.$ Then which of the following statements is not true?

If $[x]$ denotes the greatest integer $\leq x,$ then the system of linear equations $[sin\theta ]x+[-cos\theta ]y=0$, $[cot\theta ]x+y=0$

Let $A$ and $B$ be two invertible matrices of order $3 \times 3$. If $\operatorname{det}\left(\mathrm{ABA}^{\mathrm{T}}\right)=8$ and det $\left(\mathrm{AB}^{-1}\right)=8$, then det $\left(\mathrm{BA}^{-1} \mathrm{~B}^{\mathrm{T}}\right)$ is equal to

If ${a}_{1},{a}_{2},{a}_{3}.........,{a}_{n}$ are in $A.P.$ and ${a}_{1}+{a}_{4}+{a}_{7}.........+{a}_{16}=114$ , then ${a}_{1}+{a}_{6}+{a}_{11}+{a}_{16}$ is equal to :

For $x \epsilon (0,\frac{3}{2}),$ let $f(x)=\sqrt{x},g(x)=tanx$ and $h(x)=\frac{1-{x}^{2}}{1+{x}^{2}}$ . If $\phi (x)=(hof)og)(x),$ then $\phi (\frac{\pi }{3})$ is equal to:

Let ${S}_{k}=\frac{1 + 2 + 3+\ldots +k}{k}$. If ${S}_{1}^{2}+{S}_{2}^{2}+\ldots +{S}_{10}^{2}=\frac{5}{12}A$, then $A$ is equal to :

The sum of the co-efficient of all even degree terms in $x$ in the expansion of ${(x+\sqrt{{x}^{3}-1})}^{6}{+(x-\sqrt{{x}^{3}-1})}^{6},(x>1)$ is equal to

The product of three consecutive terms of a $G.P.$ is $512$. If $4$ is added to each of the first and the second of these terms, the three terms now form an $A.P.$, then the sum of the original three terms of the given $G.P.$ is :

Let $a, b$ and $c$ be the ${7}^{th}, {11}^{th}$ and ${13}^{th}$ terms respectively of a non-constant A.P. . If these are also the three consecutive terms of a G.P. , then $\frac{a}{c}$ is equal to:

Consider three boxes, each containing $10$ balls labelled $1, 2, \ldots ., 10$. Suppose one ball is randomly drawn from each of the boxes. Denote by ${n}_{i}$, the label of the ball drawn from the ${i}^{th}$ box, $(i=1, 2, 3)$. Then, the number of ways in which the balls can be chosen such that ${n}_{1}<{n}_{2}<{n}_{3}$ is :

Let $f(x)={x}^{2}, x\in R$ . For any $A\subseteq R,$ define $g(A)={x\in R :f(x)\in A}$ . If $S=[0, 4]$ , then which one of the following statements is not true?

Let ${a}_{1},{a}_{2},{a}_{3}...$ be an $A.P.$ with ${a}_{6}=2.$ Then, the common difference of this $A.P.,$ which maximise the product ${a}_{1}\cdot {a}_{4}\cdot {a}_{5},$is :

Let $f(x)={a}^{x} (a>0)$ be written as $f(x)={f}_{1}(x)+{f}_{2}(x),$ where ${f}_{1}(x)$ is an even function and ${f}_{2}(x)$ is an odd function. Then ${f}_{1}(x+y)+{f}_{1}(x-y)$ equals:

Let $z\in C$ with $Im(z)=10$ and it satisfies $\frac{2 z-n}{2 z+n}=2i-1$ for some natural number $n.$ Then

Some identical balls are arranged in rows to form an equilateral triangle. The first row consists of one ball, the second row consists of two balls and so on. If $99$ more identical balls are added to the total number of balls used in forming the equilateral triangle, then all these balls can be arranged in a square, whose each side contains exactly $2$ balls less than the number of balls each side of the triangle contains. Then the number of balls used to form the equilateral triangle is

The sum of all natural numbers $n$ such that $100<n<200$ and $H.C.F.$ $(91,n)>1$ is

If $\frac{z - \alpha }{z + \alpha }(\alpha \in R)$ is a purely imaginary number and $|z|=2$, then a value of $\alpha$ is :

Let $f:[0,1]\rightarrow R$ be such that $f(xy)=f(x).f(y),$ for all $x,y\in [0,1],$ and $f(0)\neq 0.$ If $y=y(x)$ satisfies the differential equation, $\frac{dy}{dx}=f(x)$ with $y(0)=1$ then $y(\frac{1}{4})+y(\frac{3}{4})$ is equal to:

The number of$6$ digit number that can be formed using the digits $0, 1, 2, 5, 7$ and $9$ which are divisible by $11$ and no digit is repeated is:

The greatest value of $c\in R$ for which the system of linear equations $x-cy-cz=0$, $cx-y+cz=0$, $cx+cy-z=0$ has a non-trivial solution, is

For $x\in R,$ Let $[x]$ denotes the greatest integer $\leq x,$then the sum of the series $[-\frac{1}{3}]+[-\frac{1}{3}-\frac{1}{100}]+[-\frac{1}{3}-\frac{2}{100}]+.....+[-\frac{1}{3}-\frac{99}{100}]$ is

If one real root of the quadratic equation $81 x^{2}+k x+256=0$ is cube of the other root, then a value of $\mathrm{k}$ is :