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You work in an office of 23 people (includes you)

 

 

 

 

 

 

 

 

What is the probability that 2 people in your office have the same birthday?

(Ignore Febuarary 29th)

 Feb 7, 2019
edited by CalculatorUser  Feb 7, 2019
edited by CalculatorUser  Feb 7, 2019
 #1
avatar+100578 
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See here for a detailed explanation :

 

http://mathforum.org/dr.math/faq/faq.birthdayprob.html

 

P(2 people out of 23 share the same birthday)   =

 

1 - P (none of the 23 share the same birthday) =

 

1 -   365! / [ (365 - 23)! * 365^23 ]   ≈    .5073  =    50.73%

 

 

cool cool cool

 Feb 7, 2019

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