veca,vecb,vecc are three non-coplanar ve...

`veca,vecb,vecc` are three non-coplanar vectors such that `veca+vecb+vecc=alphavecd` and `vecb+vecc+vecd=betavecalpha` then `veca+vecb+vecc+vecd` is equal to

A

`vec0`

B

`alpha veca`

C

`betavecb`

D

`(alpha+ beta)vecc`

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A

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