If $ P, Q $ and $ R $ are physical quantities having different dimensions, which of the following combinations can never be a meaningful quantity?

Question

If $ P, Q $ and $ R $ are physical quantities having different dimensions, which of the following combinations can never be a meaningful quantity?, $ \frac{P Q}{R} $, $ \frac{P-Q}{R} $, $ \frac{P R-Q^{2}}{R} $, PQ - R

MARKS App · Accepted Answer

(B) Principle of homogeneity

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