Created
September 2, 2016 16:13
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nCr
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| def comb(n, r): | |
| c = 1 | |
| if r > n / 2: | |
| r = n - r | |
| for i in xrange(1, r+1): | |
| c *= n - r + i | |
| c /= i | |
| return c |
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