BIRTHDAY SURPRISE

by Ivars Peterson

YOUR TEACHER ASKS every kid in your class for their birthday. One by one, you hear the days: July 4, April 28, November 19 . . . . What are the chances that two or more kids share a birthday? A year has 365 days, and a birthday can fall on any one of those days. So you might think it’s unlikely you’ll get a match. But it turns out you don’t need a lot of kids to have a pretty good chance of two or more classmates having the same birthday. If your class has 23 or more, it’s more than 50% likely. Why is that? The key is that the chance of a match depends on how many pairs of students there are. Start with three people: you,…

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Spider Magazine Stories, Games, Activites And Puzzles For Children And Kids (Digital) - 1 Issue, January 2024

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