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Flipping for Dollars (Posted on 2002-10-09) Difficulty: 3 of 5
We play a game as follows:

I place one dollar on the table. I repeatedly flip a coin. Each time the coin comes up heads, I double the money on the table. The first time the coin comes up tails, you take the money and the game is over.

What's a fair admission price for the game?

Would you play the game with me for $100?

See The Solution Submitted by Jim Lyon    
Rating: 3.9000 (10 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Some Thoughts The house | Comment 17 of 21 |
Well, if you look at it from the 'house' point of view: The chance for the player to get anything more than 2$ is less than 50% In fact, the chance of winning x$ is 1/x. If the house can clearly stipulate rules such as, only 10 flips for instance, giving a jackpot of 1024$ Stating then that you can play the game for any amount more than 2$ (no, make that just a bit more) and less than 1024$ is a matter of market research. For instance, setting the buy in price to 10$ would require more than 3 consecutive successful flips (1/16 chance of winning anything) Thus the house will definately make money in the end... It would just require that magic number that would make the player say "Wow, I can pay 10$ for this game, but I can win 1024$ !!" The upper limit could obviously be lifted, to get a higher payout, but that would just be unfair...
  Posted by ratsnstuff on 2003-10-14 05:30:05
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