Top 10 Brain Teasers & Puzzles - Number 8

The Birthday Party Problem

My statistics teacher told me this puzzle a while back...

If there are 20 people in a room...
What are the chances that two of them will have the same birthday?

Believe it or not the number isn't as small as you think!

Birthday Cake

Try to figure it out before looking at the solution!

<~Number 9

Number 7~>

 

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