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Balls in a Jar

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.


Puzzle ID:#26847
Fun:*** (2.47)
Difficulty:*** (2.17)
Submitted By:shenqiangAcn****!!
Corrected By:Dave




You're walking down a street, when you see some people gambling on the roadside.

The dealer says:

"There are 10 black balls and 10 white balls in this jar. You are blindfolded and you randomly pick 10 balls. If 5 of the balls you picked are black and the other 5 are white, you lose $2. Otherwise you win $1."

Is the gamble fair?


You know that, in most gambles, the dealer wins more than he loses. If not, why does he hold the gamble?

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