[Python] math.factorial

factorial 구현

def factorial(n):
    num = 1
    for i in range(1, n+1):
        num *= i
    return num

 

math.factorial

# 백준 1010번

import math

T = int(input())

for _ in range(T):
    n, m = map(int, input().split())
    bridge = math.factorial(m) // (math.factorial(n) * math.factorial(m - n))
    print(bridge)