At a meeting each of 12 people shakes hands exactly once with every other person. How many handshakes take place?
Answer and explanation
Correct answer: D.
- Step 1: Each pair shakes once: .
- Step 2: .
Answer
.
Why not the others: : Each handshake was counted twice. : People were allowed to shake their own hand. : An extra handshake per person was added.
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