Python/project_euler/problem_20/sol2.py

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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!
"""
2018-10-19 12:48:28 +00:00
from math import factorial
def solution(n):
"""Returns the sum of the digits in the number 100!
>>> solution(100)
648
>>> solution(50)
216
>>> solution(10)
27
>>> solution(5)
3
>>> solution(3)
6
>>> solution(2)
2
>>> solution(1)
1
"""
return sum([int(x) for x in str(factorial(n))])
if __name__ == "__main__":
print(solution(int(input("Enter the Number: ").strip())))