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anonymous

  • 5 years ago

A student is asked to answer 8 out of 11 questions on an exam. (a) Classify the problem as a permutation, a combination, or neither. Combination Neither Permutation (b) In how many ways can she select the questions to be answered?

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  1. amistre64
    • 5 years ago
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    there doesnt seem to be more than one group of options involved and it appears to be selection without repetition... I am guessing since its been awhile, but permutation. Would you happen to know the definitions of the words involved?

  2. amistre64
    • 5 years ago
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    permutation is is when the order that is picked matters. Combination tends to refer to without order. So this I think is actually leaning towards combination

  3. anonymous
    • 5 years ago
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    premutation is a selection of objects from a given set with regard to the order in which they are selected

  4. amistre64
    • 5 years ago
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    so the order to the questions selected is of no importance right?

  5. anonymous
    • 5 years ago
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    i guess so

  6. amistre64
    • 5 years ago
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    if you are given 10 answers to fill out and you can choose to do any 5 of them, does it matter what order you do it in?

  7. amistre64
    • 5 years ago
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    Id go with combination after reading up on the definitions :)

  8. amistre64
    • 5 years ago
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    we can write the rest of it in notation: 11! 9*10*11 ----- = -------- 8! 3! 1*2*3

  9. anonymous
    • 5 years ago
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    ok, do you possibly know how to do the second half?

  10. amistre64
    • 5 years ago
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    or 3*5*11 = 15*11 = 165

  11. amistre64
    • 5 years ago
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    let me check that again :)

  12. amistre64
    • 5 years ago
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    I wonder if id be different this way: 11! 4.5.6.7.8.9.10.11 ---- = ------------------ = same :) 3! 8! 1.2.3.4.5.6.7.8

  13. amistre64
    • 5 years ago
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    If I did it right, and thats a big if these days, the answers 165 ways

  14. anonymous
    • 5 years ago
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    ok, thank you for your help.

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