The combination, nCr, which means "combination of n taken r" can be calculated by the equation, nCr = n! / (n - r)!r! where ! is a factorial sign. For the given, 60C3 = 60! / (60 - 3)!3! = 34220 15C3 = 15! / (15 - 3)!3! = 455 Their quotient is approximately 75.21.