a and b are two co-primes. Which of the following is/are true?
(a) LCM (a, b) = a × b
(b) HCF (a, b) = 1
(c) Both (a) and (b)
(d) Neither (a) nor (b)

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Solution

A set of numbers which do not have any other common factor other than 1 are called co-prime.
The LCM of two co-prime numbers is equal to their product.
The HCF of two co-prime numbers is 1.
Hence, the correct answer is option (c).

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