Читать книгу Casino Gambling For Dummies - Swain Scheps - Страница 79

So, you may be asking yourself, what constitutes a nonindependent or dependent event? Dependent events are occurrences that are more or less likely based on the previous occurrences. Imagine a bag of five black balls and five red balls. Before you pull a ball out, you know you have a 50 percent chance of pulling out a black ball and the same odds of pulling out a red ball. Then you reach in and pull out one red ball and toss it aside. Now the odds have changed — you no longer have a 50 percent chance of pulling either ball. Because you’ve removed a red ball, your chances of pulling out a black ball are now greater (56 percent). In other words, the probability of a single pull is dependent on previous events.

So, in some situations, the past does affect the future. Another classic example is the game of blackjack, in which the composition of the remaining deck changes as cards are dealt out to players. As we’ll discuss in Chapter 7, your chances for getting a natural 21 get lower as more aces are dealt from the deck.

Almost all casino games consist of cards, dice, spinning wheels, or reels. These games almost always yield independent events. Blackjack is the rare exception, which is the main reason for its popularity.