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var fac = function(num, prod) {
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if (num === 0) { return prod }
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prod *= num;
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return fac(num - 1, prod);
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}
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// Sharon's solution
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var fac = function(num) {
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if (num === 1) {
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return 1;
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}
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return num * fac(num-1);
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}; // end of function
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