Number of ways of arranging r objects

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The number of ways of arranging r objects chosen from n, where order is important (these are called permutations) is: perm(r, n) = n! (n - r)! Also, the number of ways of choosing r objects from n without regard to order (these are called combinations) is: comb(r, n) = n! (n - r)!r! Write three functions, fact(n) (= n!), perm(r, n), comb(r, n), and a main program to test them. The main prompts the user to enter the values of r and n then prints the values of r, n, perm(r, n) and comb(r, n) to an output file, permcombout.txt. The function perm() must call the function fact(). The function comb() must call both perm() and fact().

Reference no: EM132432090

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