Let a, b, and c be positive integers. I need to prove two items... 1. abc = GCD(a,b,c) * LCM(ab,bc,ac) 2. abc = GCD(ab,ac,bc) * LCM(a,b,c) where the GCD is the Greatest Common Divisor and the LCM is the Least Common Multiple. Could I go ahead and say that (a,b,c)=1, that is relatively prime? Am I wrong in saying this part? If so, what could I say to make it right?