my code

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
long long fac(int n){
    long long M=1000000007;
    if(n<1) return 1;
    return n*fac(n-1)%M;
}

int main() {
    int T,n,m;
    cin>>T;
    while(T--){
        cin>>n>>m;
        long long M=1000000007;
        long long y = fac(n+m-1);
        y={y/(fac(n)*fac(m-1))};
        cout<<y%M<<endl;
    }

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    return 0;
}