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20 lines
319 B
Python
20 lines
319 B
Python
from math import factorial
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def combinations(n, k):
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"""
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>>> combinations(10,5)
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252
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>>> combinations(6,3)
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20
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>>> combinations(20,5)
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15504
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"""
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return int(factorial(n) / ((factorial(k)) * (factorial(n - k))))
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if __name__ == "__main__":
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from doctest import testmod
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testmod()
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