Q. 12

# Mark (√) against the correct answer in each of the following:

If and be such that then λ = ?

A. 2

B. -2

C. 3

D. -3

Answer :

Given - and

To find – Value of

Formula to be used - where and are two vectors

Tip – For perpendicular vectors, i.e. i.e. the dot product=0

Hence,

i.e.

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RD Sharma - Volume 2