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The formula for computing the number of ways of choosing r different things from a set of n things is the following:
C(n, r)= n!/(r!*(n − r) !)
The factorial method n! is defined by
n!= n*(n − 1) * (n − 2) *...*1
Discover a recursive version of the formula for C (n, r) and write a recursive method that computes the value of the formula. Place the method in a class that has a main that tests the method.
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