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Functions from N to X, up to a permutation of N
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| 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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