18 and 36, among others.
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The LCM is the multiple. The LCM of 9 and 3 is 9.
9 and 4; 36 and 1; 36 and 36; 18 and 4 ...
If you have two numbers m and n and their gcd (or gcf), g then their LCM = m*n/g so LCM = 72*252/36 = 2*252 = 504.
The pair of numbers whose GCF is 1 and LCM is 36 is 9 and 4. The numbers should be greater than their GCF and less than their LCM.
36 and 1 do well