A card is randomly selected from a standard deck of 52 cards. Find the probability of drawing an ace or a 10.

Holt McDougal Larson Algebra 1 Common Core Edition page ep12 number 24

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A standard deck of cards contains 52 different cards. It contains cards of 13 different ranks, ranging from Ace (essentially 1) through 10, followed by Jack, Queen, King, which you could think of as 11, 12, and 13. In each rank there are cards of four suits: a heart, a club, a diamond, and spade. Hearts and diamonds are red, spades and clubs are black. There are 4 cards of each rank, and 13 cards of each suit. There are no jokers. Therefore there are 4 aces (different suits) and 4 10's (different suits) That means that for each the probability of drawing an ace is 4/52 and drawing a 10 is 4/52. Since the question is worded as "or" then we don't add the probability together