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Given unit vectors m, n and p such that ...

Given unit vectors m, n and p such that angle between m and n. Angle between p and `(mtimesn)=(pi)/(6)`, then [n p m] is equal to

A

`(sqrt(3))/(4)`

B

`(3)/(4)`

C

`(1)/(4)`

D

None of these

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A
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