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How many integers m are there such that 0 < m < 100 and gcd(m, 100) is a single-digit number?

 Jul 17, 2020
 #1
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All of them have a single digit GCD except the following:
10, 20, 25, 30, 40, 50, 60, 70, 75, 80, 90 >Total =11 such numbers

 Jul 17, 2020

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