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  • I thing it is clearer if you rewrite the else part by removing the two temporary variable to be just return factorial(n-1) * n. Commented Jul 26, 2014 at 9:00
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    Just put 3 in and follow the code all the way through the end. Then 4. Then you'll understand. You could do this on paper. Commented Jul 26, 2014 at 9:15