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How many ordered pairs of positive integers (m,n) satisfy gcd(m,n) = 2 and lcm[m,n] = 108?

 Nov 3, 2018
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{m=2,n=108},{m=4,n=54},{m=54,n=4},{m=108,n=2}

 Nov 3, 2018
edited by Guest  Nov 3, 2018

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