input a integer, calculate factorial of the number.
5! = 5*4*3*2*1
4! = 4*3*2*1
Input a integer number. Please calculate 1!+2!+....+N!
Write a Python function to find combination M choose N
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- 5月 06 週四 202102:22
Python factorial-階乘&組合
5! = 5*4*3*2*1
4! = 4*3*2*1
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