If \( P, Q, R \) are physical quantities having different dimension...

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If \( P, Q, R \) are physical quantities having different dimensions, which of the following combinations can never be a meaningful quantity?
(1) \( (P-Q) / R \)
(2) \( P Q-R \)
(3) \( \left(P R-Q^{2}\right) / R \)
(4) \( (R+Q) / P \)
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