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If veca = hati - 2hatj + 3hatk and vecb...

If `veca = hati - 2hatj + 3hatk` and `vecb = -3hati + hatj - hatk` and `vecr xx veca = vecb xx veca, vecr xx vecb = veca = vecb` then a unit vector in the direction of `vecr` is:

A

`1/3(-2hati + hatj - hatk)`

B

`1/3(-2hati - hatj + 2hatk)`

C

`1/3(-2hati - hatj - 2hatk)`

D

none of these

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The correct Answer is:
B
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