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Let veca, vecb and vecc be three non- co...

Let `veca, vecb and vecc` be three non- coplanar vectors and `vecr` be any arbitrary vector. Then `(vecaxxvecb) xx (vecr xxvecc) + (vecbxxvecc)xx(vecrxxveca)+ (vecc xxveca) (vecrxxvecb)` is always equal to

A

`(veca.vecb.vecc)vecz`

B

`2(veca.vecb.vecc)vecr`

C

`3(veca.vecb.vecc)vecr`

D

none of these

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The correct Answer is:
B
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