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anonymous

  • 5 years ago

A mutiple choice test consists 8 questions with each question having 2 possible answers. how many different ways are there to mark the answers?

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  1. anonymous
    • 5 years ago
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    no more answers

  2. anonymous
    • 5 years ago
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    just one more!

  3. anonymous
    • 5 years ago
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    Use the product rule.

  4. anonymous
    • 5 years ago
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    and it would come up to?

  5. anonymous
    • 5 years ago
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    you tell me?

  6. anonymous
    • 5 years ago
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    she just wants answers

  7. anonymous
    • 5 years ago
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    You have 8 question, and you can answer each question 2 ways, how many total ways can you answer?

  8. anonymous
    • 5 years ago
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    16

  9. anonymous
    • 5 years ago
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    Nope

  10. anonymous
    • 5 years ago
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    its 8 questions and u can answer it 2 different ways which it doubles

  11. anonymous
    • 5 years ago
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    If it were just 2 questions with 2 ways to answer, how may ways would there be to fill the test?

  12. anonymous
    • 5 years ago
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    2

  13. anonymous
    • 5 years ago
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    2^2

  14. anonymous
    • 5 years ago
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    Actually that's a bad example. If there were 3 questions with 2 ways to answer each how many ways

  15. anonymous
    • 5 years ago
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    I'm not asking you cantor ;p

  16. anonymous
    • 5 years ago
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    ok :)

  17. anonymous
    • 5 years ago
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    in the same way but just with 3

  18. anonymous
    • 5 years ago
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    Lets say it's a true false test with 3 questions. I can answer True, True, True False, True, True True, False, True False, False, True True, True, False False, True, False True, False, False False, False, False Right?

  19. anonymous
    • 5 years ago
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    Yeah I know that

  20. anonymous
    • 5 years ago
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    So how many is that?

  21. anonymous
    • 5 years ago
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    25

  22. anonymous
    • 5 years ago
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    Really? Cuase I only count 8 different ways I can do the test.

  23. anonymous
    • 5 years ago
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    Err Cause rather.

  24. anonymous
    • 5 years ago
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    theres 8 ways but all toghether theres 25 if u count the true false's

  25. anonymous
    • 5 years ago
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    No. There are 8 different possible ways to complete the test.

  26. anonymous
    • 5 years ago
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    25 ????????????????

  27. anonymous
    • 5 years ago
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    So for your original question if you have 8 questions, how many possible ways can you complete the test?

  28. anonymous
    • 5 years ago
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    should i ask ?

  29. anonymous
    • 5 years ago
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    if u count them all toghether u get 25 thats how so stop u guys are suppose to help not be mean

  30. anonymous
    • 5 years ago
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    sorry i was talking to polpak

  31. anonymous
    • 5 years ago
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    w.e bye someone else will help me

  32. anonymous
    • 5 years ago
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    Giving you the answer doesn't help you

  33. anonymous
    • 5 years ago
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    well when it's done and outta the way I will not have to look back at it so..

  34. anonymous
    • 5 years ago
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    except when it's time to take the test, or when something new is taught that uses this to solve, etc.

  35. anonymous
    • 5 years ago
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    Everything builds on everything else

  36. anonymous
    • 5 years ago
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    ur helping everyone else and giving them answeers?

  37. anonymous
    • 5 years ago
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    pol, she added up all of them, she cant count either , there are 24 in that list

  38. anonymous
    • 5 years ago
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    Yeah

  39. anonymous
    • 5 years ago
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    there's 25

  40. anonymous
    • 5 years ago
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    no theres 24

  41. anonymous
    • 5 years ago
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    There are 8 lines, with 3 words on each line.

  42. anonymous
    • 5 years ago
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    This is one of those things you got someone to tell you and didn't look back about I can see.

  43. anonymous
    • 5 years ago
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    i didnt even think of that,

  44. anonymous
    • 5 years ago
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    \[8\times 3 \ne 25\]

  45. anonymous
    • 5 years ago
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    right

  46. anonymous
    • 5 years ago
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    pol, so your integration seems redundant

  47. anonymous
    • 5 years ago
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    hrm?

  48. anonymous
    • 5 years ago
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    its 2 not 3

  49. anonymous
    • 5 years ago
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    You talking about your u-sub question? please ask over there.

  50. anonymous
    • 5 years ago
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    well, 8*2 is certainly not 25.

  51. anonymous
    • 5 years ago
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    sure

  52. anonymous
    • 5 years ago
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    you mean 8 *3

  53. anonymous
    • 5 years ago
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    its 16

  54. anonymous
    • 5 years ago
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    she cant count and doesnt reason well.

  55. anonymous
    • 5 years ago
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    I do mean 8*3, but she claimed it was 2, not 3.

  56. anonymous
    • 5 years ago
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    the problem states 3 not 2

  57. anonymous
    • 5 years ago
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    wait, i guess theres some subtley here. let me see

  58. anonymous
    • 5 years ago
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    2 not 3

  59. anonymous
    • 5 years ago
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    Erg. Ok look chika. I enumerated the possible outcomes for a test with 3 questions where each question had 2 answers.

  60. anonymous
    • 5 years ago
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    ok each of those lines is ONE possibility for the test to be solved

  61. anonymous
    • 5 years ago
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    Each line in my post was a way you could complete the whole test. Not one question.

  62. anonymous
    • 5 years ago
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    so you wrote out the entire sample space

  63. anonymous
    • 5 years ago
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    Try something more simple. If you have two true or false questions how many ways can you answer them?

  64. anonymous
    • 5 years ago
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    I didn't want to try to write out the sample space for 8 questions because a) that would have given her the answer, and b) I didn't want to write 256 lines.

  65. anonymous
    • 5 years ago
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    the other way is to use multiplication rule for the first question there are 2 ways, second question there are 2 ways to answer, etc, so the total ways is 2 x 2 x 2 ...

  66. anonymous
    • 5 years ago
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    kind of like a tree diagram

  67. anonymous
    • 5 years ago
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    so you can enumerate the entire space, as you did pol for your simpler example. or you can use product rule rather than enumerate 256 cases

  68. anonymous
    • 5 years ago
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    o wait

  69. anonymous
    • 5 years ago
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    I got it

  70. anonymous
    • 5 years ago
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    http://www.khanacademy.org/v/probability--part-2?p=Probability

  71. anonymous
    • 5 years ago
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    chika, how did you get 25 !!!

  72. anonymous
    • 5 years ago
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    i got the answer

  73. anonymous
    • 5 years ago
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    pol, it is redundant because you already have cos z dz in the numerator

  74. anonymous
    • 5 years ago
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    du = cos z dz, and you already have cos z dz in the numerator

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