Problem 2: Write recursive definition of a method named Combinations that takes two integers n and r as parameters and returns the number of unique combinations of r items from a group of n items. Number of combinations C(n,r) for the given parameters n and r can be computed using the equation: n! C(n,r) r! * (n r)! 4! For example, C(4,3) should return 4. 3! • (1)! Take the input from the user and make sure that the input is valid.

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