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Explanation:

Given, P ∶ Q = 16 : 17 and Q : R = 15 ∶ 16

∴ P : Q : R = 16 × 15 : 17 × 15 : 16 × 17 = 240 : 255 : 272

⇒ R = 272/767 × 956 = 339

Hence, option (c).

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