1.

If →a+→b+→c=α→d, →b+→c+→d=β→a and →a,→b,→c are non-coplanar, then the sum of →a+→b+→c+→d=

Answer»

If →a+→b+→c=α→d, →b+→c+→d=β→a and →a,→b,→c are non-coplanar, then the sum of →a+→b+→c+→d=



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