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[" 1.Given that "vec p+vec Q=vec P" - Q ...

[" 1.Given that "vec p+vec Q=vec P" - Q "" .This can be true when - "],[[(1)vec p=vec Q,(2)bar(Q)=bar(0)],[(:3)" Neither "bar(p)" nor "bar(Q)" is a null vector ",(4)bar(p)" is perpendicular to "bar(Q)]]

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