Question 21
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At a party every guest shook hands once with every other guest, and there were 66 handshakes. How many guests were there?
- A 11
- B 33
- C 12 Correct
- D 13
Correct Answer: Option C
nC2 = 66 → n(n − 1) = 132 = 12 × 11
n = 12
Answer: 12
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