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Customers gamble by playing games of chance, in some cases with an element of skill, such as craps, roulette, baccarat, blackjack, and video poker.

Most games played have mathematically-determined odds that ensure the house has at all times an advantage over the players.

This can be expressed more precisely by the notion of expected value, which is uniformly negative ( from the player's perspective ).

This advantage is called the house edge.

In games such as poker where players play against each other, the house takes a commission called the rake.

Casinos sometimes give out complimentary items to gamblers.