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Let veca=-hati-hatk,vecb =-hati + hatj a...

Let `veca=-hati-hatk,vecb =-hati + hatj and vecc = i + 2hatj + 3hatk` be three given vectors. If `vecr` is a vector such that `vecr xx vecb = vecc xx vecb and vecr.veca =0` then find the value of `vecr .vecb`.

A

`3hati - hatj - hatk`

B

`3hati + hatj - hatk`

C

`3hati -hatj +hatk`

D

`3hati + hatj + hatk`

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The correct Answer is:
B
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