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Edited by Gaara444:
5/21/2014 1:25:43 PM
5
The Birthday Problem
Here's a simple question, what is the minimum number of people needed in order to find two people with the same birthday? 367 obviously, and that's for a 100% guarantee that two people will have the same birthday. Now let's do some higher level mathematics.
What is the number of people needed in order for a [u][b]50%[/b][/u] chance of getting two people who have the same birthday? Be careful, the answer isn't as easy as you might think, and the equation to get the answer is just as complicated. If too many people can't figure it out, I'll post the correct answer.
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1 ReplyI know the answer is, against all initial common sense and reasoning, 23. Except I don't know how to derive that answer, so I don't know if my vote counts :(
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23 has two numbers so 50/50
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1 ReplyTwo. They'll either have the same birthday or they won't. 50/50.
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Like Boot said, 2. Either they will or they won't. 50/50
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23. Could've told you that without the option.
