Why is it a dumb idea for me to go to a casino and play roulette ONLY until I double my money or break even?

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So I don’t gamble, and don’t ever indend to make it a habit.

But a friend told me to play roulette, and I would have a ~47% chance of doubling my money and , as long as I had enough money to keep doubling my stake, would have a ~95% break even if I kept going until I won and never played again.

So say I had $200k in the bank and always put my money on red

Spin 1 : $5K

Spin 2: $10K

Spin 3: $20K

Spin 4: $40k

Spin 5: $80K

Spin 6: $160k

In this scenario, I’d have a ~47% chance of winning $5k, and just a 2% chance of losing $160k?

EDIT: Although just working this out, I think I would probably put the 160k into a 4% savings account if I had it, or start off way smaller amounts e.g. $500 to reduce my chane of losing money significantly lol.

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46 Answers

Anonymous 0 Comments

What you’re talking about is a version of something called the Martingale System. The easiest way to see a problem is to look at the exponential growth of those numbers you posted. An enormous loss is easy to accrue and you’re a person with a finite bankroll to keep doubling your bets. Another practical problem is casinos will have table limits. They aren’t going to let you double your bet forever.

Without table limits or bankroll constraints, you could potentially make money. But then, if you had infinite money why would you be wasting time on roulette?

https://en.wikipedia.org/wiki/Martingale_(betting_system)

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