You are dealt two cards successively from a shuffled deck of 52 playing cards. Find the probability that both cards are black.

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A deck of cards has 52 cards of which 26 cards are black. When 2 cards are dealt from a pack of cards, the probability that the first card is black is 26/52, the probability that the second card is black is 25/51. The probability that both of them are black is (26/52)(25/51)  = 25/102

The probability that two cards dealt successively from a shuffled deck of 52 playing cards are black is 25/102

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