Marbles, could you please tell me what's wrong in this code i tried several times but i couldn't figure it out

#1

cook your dish here

def fact(n):
res = 1;
for i in range(1,n+1):
res = res *i;
return res;

def nCr(n,k):
return (fact(n)/(fact(n-k) * fact(k)))

t = int(input());
while(t):
n, k = map(int, input().split())
print(int(nCr(n-1,k-1)));
t = t-1;

#2

You cannot directly calculate nCr by fact(n) because it would exceed the range of data type, instead you would have to calculate it by iterating over the value of r and each time dividing by the value of r if possible.

#3

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