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1. At a party, everyone shook hands with everybody else. If there were 66 handshakes, how many people were at they party?
- A. 9
- B. 9
- C. 9
- D. 9
Answer: Option C
Explanation:
12C2 = 12 ×11 / 2 = 66 handshakes
So, total number of people in the party were 12.
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