a) Two numbers, \(a\) and \(b\), are relatively prime and their product is equal to \(60\). What could these numbers be? Find all the possibilities.
b) The GCD of two numbers, \(c\) and \(d\), is \(18\) and their product is \(2^4 \times 3^5 \times 7\). What could these numbers be? Find all the answers.