Q. Product of two co-prime numbers is 117. Then their LCM is :
Answer: 117
Notes: HCF of two prime numbers = 1 ∴ Product of numbers = 117 (Their LCM) 117 = 13 $latex \times$ 9 where 13 & 9 are co-prime. LCM (13, 9) = 117. Hence option [D] is correct answer.

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