নিচের কোনটি ভেক্টরের বিনিময় সূত্র?
ক (→P+→Q)+→R=→P+(→Q+→R)
খ →P(→Q+→R)=→P.→Q+→P.→R
গ →P+→Q=→P.→Q
ঘ →P+→Q=→Q+→P
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