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If you put 20 people in a room, the odds of at least 2 of the people having the same birthday are suprisingly high.

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Yup.

23 people gives you a 50% chance. IIRC 50 people means its 99% likely that 2 share the same birthday.

FWIW my birthday is July 14th. I'm gonna see my daddy for the first time on July 14th.

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can you show the math please?

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I think you can get it a couple ways, using Cr(20,2) a simple combo fuction like that.

I just do this though. 20!/365

which is 20+19+18..../365
Just all the individual probablities of nobody having the same birthday.

and its about 180.

only 2 outcomes someone shares a birthday, or they dont.
So if its 50% it = 50-50

To tired to type more thats the jist.



I am sure you can find a good clean formula on the net somewhere if ya want though.

blake