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There are 2 black jacks in a deck of 52. 4 jacks in each suit, deck of 52 has 2 red jacks and 2 black jacks.
An Ace with any 10, Jack, Queen, or King is a Blackjack. If you have a Blackjack, the dealer pays you one-and-a-half times your bet unless the dealer also has a Blackjack, in which case it's a push and neither wins.