If ` vec a, vec b , vec c ` are three non- coplanar vectors such that ` vec a + vec b + vec c

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If ` vec a, vec b , vec c ` are three non- coplanar vectors such that ` vec a + vec b + vec c = alpha vec d and vec b +vec c + vec d = beta vec a, " then " vec a + vec b + vec c + vec d ` to equal to
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