JEE Main 2021 (3 Aug, Shift 2) Maths Q76: Let and be two…

Question

Let

L_1

and

L_2

be two lines passing through the points

P(b-c, c-a, a-b)

and

Q\left(\frac{1}{l}, \frac{1}{m}, \frac{1}{n}\right)

respectively, where

\frac{1}{l}, \frac{1}{m}

and

\frac{1}{n}

are the

a^{\mathrm{th}}

,

b^{\mathrm{th}}

and

c^{\mathrm{th}}

terms of an Arithmetic Progression. If

L_1

and

L_2

intersect at the origin, then an angle between them is

Official answer

Option 2

NTA final key.

Accepted Answer

Option 2: $\frac{\pi}{2}$

Answer

$\frac{\pi}{3}$

Answer

$\frac{\pi}{2}$

Answer

$\frac{\pi}{4}$

Answer

$\frac{\pi}{6}$

JEE Main 3 August 2021, Shift 2, Maths Q76