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=αd, b+c+d=βa and a,b,c are non-coplanar, then the sum of a+b+c+d=



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