projecteuler Problem 20
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n! means n (n 1) ... 3 2 1
For example, 10! = 10 9 ... 3 2 1 = 3628800,
and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.
Find the sum of the digits in the number 100!
A = reduce(lambda a,b : a*b, range(1,101))sum = 0for n in str(A): sum+=int(n)print sum
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