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20 people in a room. 40% chance two people share a birthday.

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20 people in a room. 40% chance two people share a birthday.
Kalovale
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#5
2011-06-10, 08:33 PM
How many people do you need in a room to guarantee that there exists at least ONE group of 3 people who either:
- Know one another mutually, or
- Know nothing about anyone else in the group

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20 people in a room. 40% chance two people share a birthday. - by Kalovale - 2011-06-10, 08:33 PM

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