CF 1371B

#include <bits/stdc++.h>
using namespace std;
#define test int t; cin>>t; while (t--)
#define ll long long int
#define fellow_junior  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int main()
{
   fellow_junior
   test
   {
       ll a,c,d,e,f,i,j,k,l;
       cin>>a>>c;
       e=min(a-1,c);
       f=e*(e+1)/2;
       if(c>=a) f++;
       cout<<f<<endl;
   }


   return 0;
}