ChallengeMediumHard Number Theory ShareHard Number Theory · Medium problemHow many ordered pairs (a,b)(a,b)(a,b) of positive integers satisfy lcm(a,b)=23⋅32⋅5\operatorname{lcm}(a,b)=2^3\cdot 3^2\cdot 5lcm(a,b)=23⋅32⋅5?Check Show answer Walk through it step by step Practice more like this Review this concept