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If |vec a| = 2, |vec b| = 5 and |vec a x...

If `|vec a| = 2, |vec b| = 5` and `|vec a xx vec b| = 8` then `vec a . vec b`

A

`1/sqrt11 (i+3j-k)`

B

`1/11 (i-3j+k)`

C

`1/sqrt3 (i+j+k)`

D

`1/sqrt3 (i-j+k)`

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The correct Answer is:
A
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