this post was submitted on 01 Sep 2024
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No Stupid Questions

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The idea is that if the coin flip goes in the player's favor, they win double their bet. After winning, they can either collect their winnings, or risk them all on another coin flip to have a chance at doubling them. The initial bet is fixed at, let's say $1.

Mathematically, this seems like a fair game. The expected value of each individual round is zero for both house and player.

Intuitively, though, I can't shake the notion that the player will tend to keep flipping until they lose. In theory, it isn't the wrong decision to keep flipping since the expected value of the flip doesn't change, but it feels like it is.

Any insight?

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[–] [email protected] 17 points 3 months ago (5 children)

Once the player loses, the chain ends, and the house wins. So as long as the house can afford to keep pushing the player in to trying again, they're going to create more opportunities for the player to return their winnings to the house.

[–] [email protected] 5 points 3 months ago (4 children)

Right, and as the chain continues, the probability of the player maintaining their streak becomes infinitesimal. But the potential payout scales at the same rate.

If the player goes for 3 rounds, they only have a 1/8 chance of winning... but they'll get 8 times their initial bet. So it's technically a fair game, right?

[–] [email protected] 0 points 3 months ago (1 children)

They have a 50/50 chance each round. Doesn't matter how many rounds they've won.

[–] [email protected] 4 points 3 months ago

I'm looking at the game as a whole. The player has a 1 in 8 chance of winning 3 rounds overall.

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