project_euler.problem_020.sol4

Problem 20: https://projecteuler.net/problem=20

n! means n x (n - 1) x … x 3 x 2 x 1

For example, 10! = 10 x 9 x … x 3 x 2 x 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!

Functions

solution(→ int)

Returns the sum of the digits in the factorial of num

Module Contents

project_euler.problem_020.sol4.solution(num: int = 100) → int

Returns the sum of the digits in the factorial of num >>> solution(100) 648 >>> solution(50) 216 >>> solution(10) 27 >>> solution(5) 3 >>> solution(3) 6 >>> solution(2) 2 >>> solution(1) 1