n! = 1*2*3*...*(n - 1)*n
n! = (n - 1)! * n
25! / (23! * 5!) = 23! * 24 * 25 / (23! * 1*2*3*4*5) = 24*5*5 / (24 * 5) = 5
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n! = 1*2*3*...*(n - 1)*n
n! = (n - 1)! * n
25! / (23! * 5!) = 23! * 24 * 25 / (23! * 1*2*3*4*5) = 24*5*5 / (24 * 5) = 5