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Problem 4 - Entrance Test

If HCF(42, a) = 6 and LCM(42, a) = 252, then the value of a is

Correct: A

Product of two numbers = HCF × LCM ⇒ 42 × a = 6 × 252 ⇒ a = (6×252)/42 = 1512/42 = 36