Two vectors vec(P)andvec(Q) are given ve...

Two vectors `vec(P)andvec(Q)` are given `vec(P)=5hati+7hatj-3hatkandvec(Q)=2hati+2hatj-ahatk.` If they are mutually perpendicular then value of 'a' is

A

8

B

5

C

3

D

-8

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The correct Answer is:

D

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