Skip to main content

Let f,g:N→ N such that f(n+1)=f(n)+f(1)forall n∈ N and g be any arbitrary function. Which of the following statements is NOT true?

JEE Main 2021 — Mathematics Algebra

2021mcqmedium

Let f,g:N→Nf,g:N\rightarrow Nf,g:N→N such that f(n+1)=f(n)+f(1)∀n∈Nf(n+1)=f(n)+f(1)\forall n\in Nf(n+1)=f(n)+f(1)∀n∈N and ggg be any arbitrary function. Which of the following statements is NOT true?

Official previous-year question

Held on 25 Feb 2021 · Verified 6 Jul 2026.

Options

  1. A

    If fff is onto, then f(n)=n∀n∈Nf(n)=n\forall n\in Nf(n)=n∀n∈N

  2. B

    If ggg is onto, then fogfogfog is one-one

  3. C

    fff is one-one

  4. D

    If fogfogfog is one-one, then ggg is one-one

Did you get this right?

Sign in to track your attempts and accuracy.

Your note

Sign in to keep a private note on this question. Nothing you write is ever public.

JEE Main Algebra in other years

More JEE Main Algebra questions

Other Mathematics topics for JEE Main

Keep practicing Algebra

Work through every JEE Main Algebra PYQ, year by year.

Browse all Mathematics topics