If alpha+beta+gamma= a vecdelta and vecb...

If `alpha+beta+gamma= a vecdelta and vecbeta+vecgamma+vecdelta = b vecalpha and alpha, vecbeta, vecgamma` are non coplanar and `vecalpha` is not parallel to `vecdelta` then `vecalpha+vecbeta+vecgamma+vecdelta` equals (A) `avecalpha` (B) `bvecdelta` (C) 0 (D) `(a+b)vecgamma`

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If `alpha+beta+gamma= a vecdelta and vecbeta+vecgamma+vecdelta = b vecalpha and alpha, vecbeta, vecgamma` are non coplanar and `vecalpha` is not parallel to `vecdelta` then `vecalpha+vecbeta+vecgamma+vecdelta` equals (A) `avecalpha` (B) `bvecdelta` (C) 0 (D) `(a+b)vecgamma`

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