In blackjack, the casinos have approximately a 4.5-percent edge over the player, based on the rules they require players to adhere to. This means that, over a large enough sample size (number of hands played), the casino will generate net profits of four and a half cents on every dollar wagered on the game. This average of four and a half cents takes into account all the players who walked away big winners (including all winning streaks), all the players who walked away big losers, and everybody in between. At the end of the day, week, month, or year, the casino always ends up with
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