At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were there in the party?

1. At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were there in the party?

[BKB Senior Officer-2012 : 2012]

1. 18

2. 9

3. 12

4. 15

Answer

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