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The position vectors of vertices of a De...

The position vectors of vertices of a `DeltaABC` are `4hati - 2 hatj , hati + 4hatj - 3hatk` and `-hati + 5hatj + hatk` respectively , then `angleABC` is equal to

A

`(pi)/6`

B

`(pi)/4`

C

`(pi)/3`

D

`(pi)/2`

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The correct Answer is:
D
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