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anonymous

  • 5 years ago

10 pencils and 8 pens are in a box, 11 writing utensils are to be selected at random, without replacement from the box, If the pens and pencils are equally likely to be selected, determine the probability that seven pencils and four pens are selected.

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  1. anonymous
    • 5 years ago
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    I think it is 10 Choose 7 times 8 Choose 4 10! 8! ---- * ---- 7! 3! 4!4!

  2. anonymous
    • 5 years ago
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    {(10C7)*(8C4)]/(18C11)

  3. anonymous
    • 5 years ago
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    10 * 9 * 8 * 7! ------------ = 120 7! * 3 * 2 * 1 8 * 7 * 6 * 5 * 4! -------------- = 70 4! * 4 * 3 * 2 * 1

  4. anonymous
    • 5 years ago
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    18! ---- 11! 7! 18 * 17 * 16 * 15 * 14 * 13 * 12 *11! --------------------------------- = 31824 11! * 7 * 6 * 5 * 4 * 3 * 2 * 1

  5. anonymous
    • 5 years ago
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    120 * 70 -------- 31824 8400 ------ needs to be reduced. 31824

  6. anonymous
    • 5 years ago
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    175/663

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