int puzzle (int start, int end) { if (start > end) return start - end; else if (start = = end) return start + end; else return end * puzzle (start + 1, end - 1); } Consider the accompanying definition of a recursive function. What is the output of the following statement? cout << puzzle (3, 7) << endl; a. 10 b. 21 c. 42 d. 420
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