Mind Bender # 10 : Birthday Wager

Imagine you have just walked into a room of 22 unrelated people, whom you’ve never met before.

Then, someone poses the question:

“Who is prepared to wager that two people in the room have their birthday on the same day of the year?”

If you were being offered the odds of 20:1 … would you be prepared to bet on the likelihood of two of the birthdays being on the same day of the year?

And would you also like to explain how you arrived at your conclusion.

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