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factorial
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| function factorial(n) { | |
| if (n < 0 || typeof n != 'number') | |
| { return null; } | |
| if (n === 0) | |
| { return 1;} | |
| for (var i = n - 1; i > 0; i--) | |
| { n *= i; } | |
| return n; | |
| } |
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