If vec a,vec b , vec c are unit vectors ...

If `vec a,vec b , vec c` are unit vectors such that `veca + vec b+ vecc = 0` and `lambda = veca.vecb + vecb.vecc+vecc.veca `and `d = veca xx vecb + vecb xx vecc + vecc xx veca`, then `(lambda,vecd)` is

A

`3/2, vec3a xx vecb`

B

`3/2, 3veca xx vecc`

C

`-3/2, 3veca xx vecc`

D

`-3/2, 3veca xx vecb`

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The correct Answer is:

D

NA

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