Multiple choice general knowledge math & puzzles

At the end of the Business conference the ten people gave shake hands to each other once. how many shake hands will be altogether

  1. 20

  2. 45

  3. 55

  4. 90
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The number of handshakes among $n$ people is given by the combination formula $n(n-1)/2$. For 10 people: $10 \times 9 / 2 = 45$. Each person shakes hands with every other person exactly once.

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