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If veca,vecb and vecc are non-coplaner,t...

If `veca,vecb` and `vecc` are non-coplaner,then value of
`veca{(vecbxxvecc)/(3vecb.(veccxxveca))}-vecb.{(veccxxveca)/(2vecc.(vecaxxvecb))}` is

A

`(-1)/(2)`

B

`(-1)/(3)`

C

`(-1)/(6)`

D

`(1)/(6)`

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