Blackjack was played with one 52-card deck until card counting was discovered. Once casinos realized that card counters could gain an advantage over the "house" (casino) fairly easily on single deck games, they began to change the rules and add more decks. Today, you can find very few single deck games, and if you do, the rules have been altered to heavily favor the house. There are some double deck games, but most blackjack games are known as "shoe" games. They are 4, 6, or 8 deck games where the cards are placed in a plastic holder. Dealers do not hold the cards while they deal like they would in a single or double deck game. Shoe games make it more difficult for card counters to gain an advantage, but it is still possible to gain an advantage counting cards in shoe games under the right conditions.
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It depends on the blackjack variation that you are playing -- it can be played with as few as 1 deck and as many as 8 decks. Since- and double-deck games are dealt by hand, while games with 4, 6, and 8 decks are dealt from a shoe. In general, the higher the number of decks that are used corresponds to more liberal betting options available to a player. For example, in a single-deck game, players can double on 9, 10, or 11 only, while in an 8 deck game, the player can double on any two cards. Also, many casinos have moved to paying 6-5 for a single-deck blackjack, while continuing to pay 3-2 for a blackjack from a 4, 6, or 8 deck game.
Only one, decks of cards have very odd breeding patterns and can only produce one full deck of 52 cards per year
The answer depends on how many cards are drawn, whether or not at random, from ordinary decks of cards, with or without replacement.
I think its 5
I assume you mean deck not decks? But that would be 1 queen of diamonds per standard 52 deck of cards.