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20 people in a room. 40% chance two people share a birthday.
#1
What? How do you do that calculation. Someone explain it to me. I'm sure it has something to do with combinations or permutations but I don't know how they get to that % via math.

Edit: It's 41.1% actually. But the calculation in general:

You have 20 people in a room what is probability two people share a birthday?

Someone explain.
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20 people in a room. 40% chance two people share a birthday. - by OB3LISK - 2011-06-10, 02:34 PM

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