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


Answer: C

Computer Science & Information Technology

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