A standard deck of 52 cards has 13 ranks (Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King) and 4 suits (spades, hearts, diamonds, and clubs), such that there is exactly one card for any given rank and suit. Two of the suits (spades and clubs) are black and the other two suits (hearts and diamonds) are red. The deck is randomly arranged. What is the probability that the top card is red and the second card is black?

There are 26 ways to choose the first card to be red, then 26 ways to choose the second card to be black. There are 52 × 51 ways to choose any two cards. So the probability is 26 × 26/52 × 51 = 13/51.