ChallengeMedium ShareChallenge · Medium problemHow many ordered pairs of positive integers (a,b)(a,b)(a,b) satisfy lcm(a,b)=72\operatorname{lcm}(a,b)=72lcm(a,b)=72 and gcd(a,b)=6\gcd(a,b)=6gcd(a,b)=6?A222B333C444D666E888Check Show answer Walk through it step by step Practice more like this