Multiple choice general knowledge math & puzzles

It was Helen's first day at school. The teacher suggested that it would be a good idea for each child to meet every other child in the class. The teacher said, "When you meet, please shake hands and introduce yourself by name." If there were 10 children in the class, how many total handshakes were there?

  1. 56

  2. 78

  3. 33

  4. 45
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The number of handshakes in a group of n people is calculated by the formula n(n-1)/2. For 10 children, it is 10 * 9 / 2 = 45.

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