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timcdlucas/Summationproblems

Created July 8, 2014 09:02
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Summationproblems
from sympy import *
from sympy import init_printing ;
init_printing()
n, k = symbols('n k')
s1 = summation(k, (k, 0, n)) # works fine
s2 = summation((factorial(n)*n**k)/factorial(k)*factorial(n-k), (k, 0, n)) # works but gives crazy results
s3 = summation((factorial(n)*n**k)/(factorial(k)*factorial(n-k)), (k, 0, n)) # python hangs
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