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`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

`alphaveca`

B

`betavecb`

C

0

D

`(alpha+beta)vecc`

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