Probability-Cards

As shown above, a classic deck of cards is made up of 52 cards, 26 are black, 26 are red. Each color is split into two suits of 13 cards each (clubs and spades are black and hearts and diamonds are red). Each suit is split into 13 individual cards (Ace, 2-10, Jack, Queen, and King).

If you select a card at random, what is the probability of getting:

1) A(n) 4 of Spade s?


2) A Diamond or Heart?


3) A number smaller than 7 (counting the ace as a 1)?

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  1. 1) there is only 1 four of spades,
    so prob(4ofspades) = 1/52

    2. There are 13 diamonds and 13 hearts, so
    prob(your event) = 26/52 = 1/2

    3. you do it. How many of the 52 cards are less than 7 ?

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