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Let L_1 and L_2 be two lines, represented as, L_1: = i + j + λ(2 i - j + k) and L_2: = 2 i + j - k + μ(4 i - 2 j + 2 k), where λ and μ are scalars.…

CUET UG 2025 — Mathematics Geometry

2025mcqmedium

Let L1L_1L1​ and L2L_2L2​ be two lines, represented as,

L1:r⃗=i^+j^+λ(2i^−j^+k^)L_1: \vec{r} = \hat{i} + \hat{j} + \lambda(2\hat{i} - \hat{j} + \hat{k})L1​:r=i^+j^​+λ(2i^−j^​+k^) and L2:r⃗=2i^+j^−k^+μ(4i^−2j^+2k^)L_2: \vec{r} = 2\hat{i} + \hat{j} - \hat{k} + \mu(4\hat{i} - 2\hat{j} + 2\hat{k})L2​:r=2i^+j^​−k^+μ(4i^−2j^​+2k^), where λ\lambdaλ and μ\muμ are scalars. Then which of the following are true?

(A) L1L_1L1​ is perpendicular to L2L_2L2​.

(B) L1L_1L1​ is parallel to L2L_2L2​.

(C) L1L_1L1​ passes through the point (1, 1, 0)

(D) L2L_2L2​ passes through the point (2, 1, -1)

Choose the correct answer from the options given below:

Official previous-year question

Held on 27 May 2025 · Verified 13 Jul 2026.

Options

  1. A

    (A) and (D) only

  2. B

    (B), (C) and (D) only

  3. C

    (C) and (D) only

  4. D

    (A) and (C) only

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