For instance, if you are considering in making a bet on the numbers 3 or 11 in craps for proposition betting, when you look in to the chances for the numbers to show up, then it is twice for every 36 rolls. Whether your random number generator is programmed this way is a different deal.
When you go by the method of manipulating the appearance of the numbers, you will be counting the number of times or the number of rolls that has gone away without the number 11 or 3 showing up after the last time it was showing 11 or 3.
For a strategic approach, be sure that you are concentrating on every roll that passes on and be sure to count 20 rolls from the last time the number 11 or 3 did show up and from the 21st roll you will be betting on the numbers, because according to statistical probabilities you are manipulating the odds for the number 11 or 3 to show up for the twice per 36 rolls that you are considering in your strategy.
Since the payoff for the proposition bets in 15:1, better than many of the other bets you are likely to reap in. However, from the 21st to 36th roll that you have planned you will be betting the same unit of money. If you hit you are making the profits for your investment by 15 times more!