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Pulsified333

  • one year ago

Two fair die are rolled. (1) What is the probability they sum to 10, 7, or 4? (2) What is the probability they sum to at least 11?

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  1. anonymous
    • one year ago
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    So for two dices, there are 6*6 = 36 possible combinations right?

  2. Pulsified333
    • one year ago
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    yes

  3. anonymous
    • one year ago
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    how many combinations add up to 4?

  4. Pulsified333
    • one year ago
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    2

  5. anonymous
    • one year ago
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    1,3 3,1 2,2 there are 3

  6. Pulsified333
    • one year ago
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    okay

  7. anonymous
    • one year ago
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    so for 4, it is 3/36 = 1/12

  8. Pulsified333
    • one year ago
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    correct

  9. anonymous
    • one year ago
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    so you can do the same for 7 and 10 to for (1).

  10. Pulsified333
    • one year ago
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    are you saying that there are 6 ways to add up to 6?

  11. anonymous
    • one year ago
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    yes, so its probability is 1/6

  12. Pulsified333
    • one year ago
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    btw how did you get 1/12 for 4?

  13. anonymous
    • one year ago
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    sorry sorry no there's 5 ways to add up to 6

  14. anonymous
    • one year ago
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    1,5 2,4 3,3 4,2 5,1

  15. Pulsified333
    • one year ago
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    The number is seven my bad

  16. anonymous
    • one year ago
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    Oh yes

  17. Pulsified333
    • one year ago
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    can you explain how you got 3/36 though for 4?

  18. anonymous
    • one year ago
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    3 combinations to get 4 / all the possible combinations = 3/36.

  19. Pulsified333
    • one year ago
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    how is it 36 though

  20. anonymous
    • one year ago
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    there are 6 possibilities on the first dice & 6 possibilities on the second dice. 6 * 6 = 36

  21. Pulsified333
    • one year ago
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    oh never mind. sorry I didn't think about that, I've had a really long day. You are right

  22. anonymous
    • one year ago
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    oh ok! :D

  23. Pulsified333
    • one year ago
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    so in total it should be 6/36+3/36+3/36=12/36=1/3

  24. anonymous
    • one year ago
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    and for (2), you just have to find the probability that the sum is 12 and subtract it from 1

  25. anonymous
    • one year ago
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    and yes

  26. Pulsified333
    • one year ago
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    why subtract one for the sum is 12?

  27. anonymous
    • one year ago
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    at least 11 is the same as not 12, becuase the biggest sum is 12

  28. Pulsified333
    • one year ago
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    right. So that means 11 and 12?

  29. anonymous
    • one year ago
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    so, "at least 11" refers to sums 2-11. so the only sum that is not considered is 12.

  30. Pulsified333
    • one year ago
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    oh

  31. anonymous
    • one year ago
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    do you get that?

  32. anonymous
    • one year ago
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    so what you have to do is 1 - (probability of getting 12) = probability of all sums at least 11

  33. Pulsified333
    • one year ago
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    so is that mean the answer is 35/36?

  34. anonymous
    • one year ago
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    yes :D

  35. Pulsified333
    • one year ago
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    it says 35/36 is wrong but the first answer is right

  36. anonymous
    • one year ago
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    really? :,o let me think I'm sorry...

  37. Pulsified333
    • one year ago
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    its okay

  38. anonymous
    • one year ago
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    AHHH I READ THE PROBLEM WRONG... YOU WERE RIGHT IT IS PROBABILITY OF 11 AND 12

  39. Pulsified333
    • one year ago
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    so its 1/12

  40. anonymous
    • one year ago
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    I CAN'T BE MORE SORRY THAN THIS SORRY

  41. anonymous
    • one year ago
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    YES

  42. Pulsified333
    • one year ago
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    dude its alright

  43. Pulsified333
    • one year ago
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    That was right

  44. Pulsified333
    • one year ago
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    :D thank you very much

  45. anonymous
    • one year ago
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    thank you :)

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