, but I understand the desire to find one that works.The main problem with his explanation is assuming "conditional probability", where there is none. He says that after you've lost the first 5 bets, there's only a 10% chance that you'll lose the sixth one. But that's not how it works. After you've lost your first 5 bets, there's more like a 66% chance that you'll lose your sixth one.
Let's take a concrete example with a coin...
Let's say we're always betting on heads. He would say after you flip a coin 3 times, and get tails each time there's a 87.5% chance that you'll get a heads on the 4th one. But that's not true, as you might be able to guess there's only a 50% chance you'll flip heads.
So why does he say 87.5%? Well there's an 87.5% chance each time that you start a new wager at the first level that you'll be a winner on one of the 4 tosses. After you toss one wrong, there's only a 75% chance that you'll be a winner on the next two tosses. If you toss the next one wrong, there'll only be a 50% chance that you get the final one right.
So when he says there's a 10.5% chance that you'll lose all your money on the 6th one, what that really means is that, every time you start from level one, there's a 10.5% chance you'll hit your stoploss. You will win 90% of the time (but you'll only win $6). And 10% of the time you'll lose $114.
I hope that makes some sense!

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