import math def nCr(n,r): f = math.factorial return f(n) / f(r) / f(n-r) a = list(map(int,input().split('\n'))) print(a) for i in range(1,a[0]+1): print(int(nCr((a[2*i-1]+a[2*i]),(a[2*i]-1))))
2 1 3 2 3
[2]
Traceback (most recent call last): File "./prog.py", line 10, in <module> IndexError: list index out of range