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#include <iostream>

using namespace std;

int N,M,T;

int sum = 0;

void dfs(int pre, int left, int pos){

if(pos>N){

return ;

}

if(pos==N && left==0){

sum++;

return ;

}

for(int i= pre; i<=left; i++){

dfs(i ,left-i, pos+1);

}

}

void work(){

sum=0;

dfs(0, M,0);

cout<<sum<<endl;

}

int main(){

cin>>T;

while(T--){

cin>>M>>N;

work();

}

return 0;

}