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Scinawa/function_n_x_up_n.py

Last active March 24, 2016 06:16
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Functions from N to X, up to a permutation of N
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function_n_x_up_n.py
from math import factorial
x=10
n=3
res = math.factorial(x+n-1) / ( math.factorial(n) * math.factorial(x+n-1-n))
>>> len([i for i in itertools.combinations_with_replacement(range(0,x), n)]) == res
True
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