If gcd(a,b)=6\gcd(a, b) = 6gcd(a,b)=6 and lcm(a,b)=120\text{lcm}(a, b) = 120lcm(a,b)=120, which pair could be (a,b)(a, b)(a,b)?
(12,60)(12, 60)(12,60)
(18,40)(18, 40)(18,40)
(24,30)(24, 30)(24,30)
(20,36)(20, 36)(20,36)