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The vectors veca , vecb and vecu xx vecu...

The vectors `veca , vecb and vecu xx vecu` are of the same length and taken pairwise they form equal angles. If ` veca = hati +hatj and vecb =hatj +hatk` then `vecc` is equal to

A

`hati + hatk`

B

`hati + 2hatj + 3hatk`

C

`-hati + hatj + 2hatk`

D

`1/3(-hati + 4hatj - hatk)`

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The correct Answer is:
A, D
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