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Math Help - Playing cards and probability

  1. #1
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    Question Playing cards and probability

    Please help me solve this-

    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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  2. #2
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    hello dear

    i think it is going 2 be :

    P(BLACK)= 26 choose 2 / 52 chooce 2
    in another way

    26C2
    ______= 0.245
    52C2

    (( the 26 comes from 13 spades+13 club >>>as they called it "i think " :S :S ))

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  3. #3
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    Quote Originally Posted by CaptainBlack View Post
    Probability that the first is black is 13/52.

    The probability that the second is black given that the first is black is 12/51

    The answer you seek is the product of these (probably)

    CB
    I regret to inform you that half of the cards in a standard deck are black... spades and clubs =13+13=26/52
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  4. #4
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    Quote Originally Posted by knightmaref5 View Post
    Please help me solve this-

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


    What's the probability that the first card is black?

    \frac{26}{52}

    And now that you have 1 of the black cards, there are only 25 left out of 51, so the product of these is our answer

    \frac{26}{52}\cdot\frac{25}{51}

    whatever that comes out to be
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  5. #5
    Grand Panjandrum
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    Quote Originally Posted by artvandalay11 View Post
    I regret to inform you that half of the cards in a standard deck are black... spades and clubs =13+13=26/52
    Oooppsss.. would you believe it was a deliberate error to check who was awake?

    CB
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