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vec (PQ) is perpendicular to vec (QR). T...

`vec (PQ)` is perpendicular to `vec (QR)`. The position vectors of P, Q and R are `( 4 hat i + 7 hat j - hat k)`, `(5 hat i + y hat j + hat k)` and `(- 2 hat i + hat j + 4 hat k)` respectively.
What is the value of y?

A

`-9`

B

`-8`

C

7

D

8

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