The LCM of two numbers is 63 and their HCF is 7. How many such pairs of numbers are possible?
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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