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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 My take | Comment 10 of 21 |
As TomM pointed out, any finite number is a "fair" price for the game. The question, though, really comes down to whether you can afford to lose $100. If the game can be repeated over and over, it comes down to the odds that you will clear out your bank account before you hit a big payoff.

This is kind of one of those cases where "pure" mathematics and the real world butt heads. An analogous question might be, "Would you pay $100 for a one-in-a-billion chance at $1 trillion?" Your expected payout is $1000, but that doesn't mean you should bet the farm...
  Posted by friedlinguini on 2002-10-10 03:45:11
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