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Math Help - Combinations/ Permutations question

  1. #1
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    Combinations/ Permutations question

    173

    THe number of arrangements of the letters of the word "MULTIPLE" that can be made preserving the order in which the vowels (U,I,E) occur and not counting the original attangement is:

    1. 6719
    2. 3359
    3. 6720
    4. 3214
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  2. #2
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    Quote Originally Posted by champrock View Post
    173

    THe number of arrangements of the letters of the word "MULTIPLE" that can be made preserving the order in which the vowels (U,I,E) occur and not counting the original attangement is:

    1. 6719
    2. 3359
    3. 6720
    4. 3214

    Out of the 8 possible positions, we choose 3 in order to place vowels U, I, E, and we have C(3,3) ways of choosing the vowels, i.e. only one way - their required order. Then we arrange the remaining in 5!/2! (we divide by 2! because of the repetition of letter L) and then we subtract 1, as required by the question.

    That is,

    C*(8,3)*C(3,3)*5!/2! -1 = 3359.
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  3. #3
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    thanks! was missing the double "L"
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