If a and b are relatively prime, what is their LCM?
If two numbers are relatively prime then their greatest common factor will be 1.
∴ HCF(a, b) = 1
Using the formula, Product of two numbers = HCF × LCM
we conclude that,
a × b = 1 × LCM
∴ LCM = ab
Thus, LCM(a, b) is ab.