What is the Martingale tactic?

Martingale was popularized in the 18th century by the French mathematician Paul Pierre Levy. This is a strategy to double bet on losing. Then, the American mathematician Joseph Leo Doob did research more carefully because he wanted to find a way to refute the 100% possibility of winning this method.

The strategy goes like this: you place 1 of your initial bet and if you lose, the next bet will be doubled. As time goes by, you will have 1 meal and this will help you get back all the previous losses.

Think of it as a simple gambling game of coin tossing, with a chance of winning or losing 5/5. The first time you bet 1 dong. If you lose, you lose 1 penny so you bet 2 coins. If you win, then there are 2 coins, minus 1 coin of the initial loss you will have 1 dollar profit. If you lose, then bet 4 VND, if you win, you will gain 4 VND, minus 3 VND of the first 2 losses, you will have a profit of 1 VND. Just keep going until there is a win, then return to bet 1 dong.

Just 1 win, you will remove all your losses first and have a little profit

So what is the difficulty here, it is the limit on the amount of money you have. If you only have 10 coins, then you only lose 4 times. Because the first time the loss is 1 dong, the second has a loss of 2 dongs, the third time, the loss of 4 dongs is already 7 dong. The last time if the bet is always 3 coins and lose, it will be considered out. Thus, it takes a lot of money to play this way.