Badal Soni is organizing his marriage party in which N number of people are invited and only K people joined the party.
Note: Badal is also present in the party!
K <= N
In the party everyone starts shaking hands with everyone else. Given, any two persons shake hand exactly once.
Can you tell the total number of handshakes ?
Input Format
The first line contains the number of test-cases T, T lines follow.
Each line then contains integer N (the total number of invites sent by Raman) and space separated integer K (the total number of people joined the party)
Output Format
Print the number of handshakes for each test-case in a new line
Constraints
1 <= T <= 1000
0 < K <= N < 106
Case 1 : Only one person comes to the party. That is one handshake.
Case 2 : Two people come to the party. Therefore total handshakes equals 3
