Multiple choice general knowledge math & puzzles

6 people meet for a business lunch. Each person shakes hands once with each other person present. How many handshakes take place?

  1. 30

  2. 21

  3. 18

  4. 15
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The number of handshakes among n people is calculated using the formula n(n-1)/2. For 6 people, this is 6(5)/2 = 15. Each person shakes hands with 5 others, but we divide by 2 to avoid double-counting the same handshake.

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