21 is an example of the preferred casino games after slot machines. As the purpose of the game is to get the sum of the cards as near to twenty-one, as likely, without surpassing the number. Each gambler is dealt with 2 cards, including the dealer himself. Whilst the gambler's card face up, the dealer has one card facing down, that is hidden from others. The dealer has to deal himself cards till his hand at least equals seventeen.
The others opt to take a card relying on their total, else they can simply 'pass'.
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