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

`veca,vecb,vecc` are three non-coplanar such that `veca + vecb + vecc = alpha vecd` and `vecb + vecc + vecd = beta veca`, then `veca + vecb + vecc + vecd` is equal to:

A

`vec0`

B

`alpha veca`

C

`betavecb`

D

`(alpha+ beta)vecc`

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The correct Answer is:
A
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