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veca, vecb, vecc are non-zero unit vecto...

`veca, vecb, vecc` are non-zero unit vector inclined pairwise with the same angle `theta`. P,q,r are non-zero scalars satisfying `veca xx vecb + vecb xx vecc=pveca + qvecb + rvecc`. Now, answer the following questions:
Volume of parallelogram with edges a,b and c is equal to:

A

`p+(q+r)cos theta`

B

`(p+q +r)cos theta`

C

`2p-(r+q)cos theta`

D

None of these

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The correct Answer is:
A
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