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    Question

    The LCM of two numbers is 63 and their HCF is 7. How

    many such pairs of numbers are possible?
    A 4 Correct Answer Incorrect Answer
    B 3 Correct Answer Incorrect Answer
    C 2 Correct Answer Incorrect Answer
    D 1 Correct Answer Incorrect Answer

    Solution

    Let the two numbers be '7a' and '7b'. So, 7a X 7b = 63 X 7 Or, ab = 9 So, possible values of 'a' and 'b' = (9, 1) {(3, 3) is another possibility but since they are not co-primes, we may disregard that case}.

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