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If L,M,N are physical quantities with different dimensions, then which of the following combinations can never be meaningful quantity?(1.) LM/N (2.) LN - M(3.) LN - M^2/N (4.) L - M/N

Answer» If L,M,N are physical quantities with different dimensions, then which of the following combinations can never be meaningful quantity?
(1.) LM/N (2.) LN - M
(3.) LN - M^2/N (4.) L - M/N


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