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zarkam21

  • one year ago

You have a 3-card deck containing a king, a queen, and a jack. You pick a card, put it back, and pick another. What is the probability that you do not pick the same card twice?

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  1. welshfella
    • one year ago
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    |dw:1441025727089:dw|

  2. welshfella
    • one year ago
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    use this tree diagram there are 9 possible paths you need to count the paths containing no duplicats

  3. zarkam21
    • one year ago
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    1/3?

  4. welshfella
    • one year ago
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    no Thats the probabilty of picking the same card twice

  5. welshfella
    • one year ago
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    you need JQ , JK etc

  6. zarkam21
    • one year ago
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    okay for example JQ would be 2/3?

  7. zarkam21
    • one year ago
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    I'm little confused

  8. welshfella
    • one year ago
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    |dw:1441025988236:dw|

  9. welshfella
    • one year ago
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    - you need the paths in blue

  10. zarkam21
    • one year ago
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    In Blue?

  11. welshfella
    • one year ago
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    well different color

  12. zarkam21
    • one year ago
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    so jqk, qjk, and kjq

  13. welshfella
    • one year ago
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    JQ JK etc

  14. welshfella
    • one year ago
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    yes

  15. welshfella
    • one year ago
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    you said the correct answer already

  16. zarkam21
    • one year ago
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    2/3?

  17. welshfella
    • one year ago
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    there are 6 of these out of a possible 9

  18. welshfella
    • one year ago
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    right do you follow it now?

  19. zarkam21
    • one year ago
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    6/9 which reduces to 2/3 :]

  20. welshfella
    • one year ago
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    yea

  21. zarkam21
    • one year ago
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    Is that the answer to the problem, 2/3?

  22. welshfella
    • one year ago
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    yes

  23. zarkam21
    • one year ago
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    Thank you =]

  24. welshfella
    • one year ago
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    do you understand the tree diagram?

  25. welshfella
    • one year ago
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    yw

  26. zarkam21
    • one year ago
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    Yes, you took the main cards and listed the possible outcomes for each one

  27. welshfella
    • one year ago
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    thats right each path in the diagram illustrate one of the 9 possible outcomes

  28. zarkam21
    • one year ago
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    Yes :D Thanks Again!

  29. welshfella
    • one year ago
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    |dw:1441026383234:dw|

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