Slot machines are able to program the win percentage of the game. If it is 90%, over a great enough time you will end up with 90% of your money back. The casino pockets the rest. I believe there limits to how low this percentage can be and some places it has to be advertised.
Card games and roulette generate these percentages from the maths behind the rules. There being two greens gives the house 5.25% of the money inputted. The dealer in blackjack has favourable odds so will win more
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