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[" 4.If "P" ,"Q" ,"R" are physical quant...

[" 4.If "P" ,"Q" ,"R" are physical quantities,having different "],[" dimensions,which of the following combinations "],[" can never be a meaningful quantity? "],[[" (A) "PQ-R," (B) "," PQ "R],[," (C) "(P-Q)/R," (D) ",(PR-Q^(2))/QR]]

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