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If P, Q, R and S are the points with pos...

If P, Q, R and S are the points with position vectors `hati+hatj+hatk,2hati+5hatj,3hati+2hatj-3hatkandhati-6hatj-hatk` respectively, then the angle between PQ and RS is

A

0

B

`(pi)/(2)`

C

`pi`

D

`(pi)/(3)`

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The correct Answer is:
A
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