University of Illinois at Urbana-Champaign
Office for Mathematics, Science, and Technology Education
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Random Birthday

Random Birthday image Find out just how likely it is that two or more random Birthdays are found on the same day.
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Author: Nick Exner
Date Created: 10/22/2001
Last Modified: 9/9/2016

Detailed Description:

Happy Birthday! There's a birthday in your class today! Or will there be two? How likely is it that two people in your class have the same birthday?

This simulation will allow you to run many trials with different class sizes to explore the probability of birthday matches with various class sizes. When do you think the probability of 2 people having the same birthday becomes more likely than unlikely?

Resource Type:
Interactive (Lessons that include an interactive component, generally Java, JavaScript, Flash, or a TI program.)
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