Number of Handshakes


Tests
    Test 1     Test 2     Test 3     Test 4     Test 5     Test 6     Test 7     Test 8     Test 9     Test 10

Sample
Number of Handshakes [Test 1]
1) A team of 20 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?
2) A team of 20 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?
3) A team of 10 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?
4) A team of 14 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?
5) A team of 14 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?
6) A team of 14 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?
7) A team of 22 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?
8) A team of 21 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?
9) A team of 13 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?
10) A team of 15 members all shake hands with each other so that each member shakes hands with every other person. How many handshakes happened?