Question: Given a positive integer n and a nonnegative integer r not exceeding n, list all the r-combinations of the set {1, 2, 3,...,n} in lexicographic

Given a positive integer n and a nonnegative integer r not exceeding n, list all the r-combinations of the set {1, 2, 3,...,n} in lexicographic order.

Need help putting this into a Java code program.

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