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anonymous

  • one year ago

three cards are drawn from an ordinary deck of 52 cards. each card is replaced in the deck before the next card is drawn. what is the probability that at least one of the cards was a spade

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  1. anonymous
    • one year ago
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    Ok first how many spades are in a deck of cards

  2. anonymous
    • one year ago
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    13

  3. anonymous
    • one year ago
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    52C3

  4. anonymous
    • one year ago
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    soo divde 52 cards by 13 cards

  5. anonymous
    • one year ago
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    what do i put in the numerator?

  6. anonymous
    • one year ago
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    it says at least 1 spade so im confused

  7. anonymous
    • one year ago
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    round it to the nearest whole number

  8. anonymous
    • one year ago
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    P = 1 - P(no spade cards)

  9. anonymous
    • one year ago
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    im so confused now lol

  10. anonymous
    • one year ago
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    at least 1 spade card means P(1 spade) + P(2 spades) + P(3 spades). If you do this way, you'd have to calculate 3 times. But instead, just calculate the complement and subtract from 1

  11. anonymous
    • one year ago
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    wont i get a negative number if i subtract from 1?

  12. anonymous
    • one year ago
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    No, you won't

  13. anonymous
    • one year ago
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    what

  14. anonymous
    • one year ago
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    what would you get if you do P(no spade cards) ?

  15. anonymous
    • one year ago
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    39/52

  16. anonymous
    • one year ago
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    oh i have to subtract the fraction

  17. anonymous
    • one year ago
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    1-(39/52)=1/4

  18. anonymous
    • one year ago
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    you are drawing 3 cards, not 1 card

  19. anonymous
    • one year ago
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    1 - (39/52)^3

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