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Math Help - Combinatorics - L preceding N

  1. #1
    Senior Member DivideBy0's Avatar
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    Combinatorics - L preceding N

    How many ways can the letters of the word PENCILS be arranged so that the L is preceding the N?

    Thanks.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by DivideBy0 View Post
    How many ways can the letters of the word PENCILS be arranged so that the L is preceding the N?

    Thanks.
    Half of the number of ways that can the letters of the word PENCILS be arranged

    RonL
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by CaptainBlack View Post
    Half of the number of ways that can the letters of the word PENCILS be arranged

    RonL
    why?
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  4. #4
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    Quote Originally Posted by Jhevon View Post
    Half of the number of ways that can the letters of the word PENCILS be arranged.
    why?
    In any arrangement either L comes before N or visa versa.
    That is one-half for L before N.
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  5. #5
    Senior Member DivideBy0's Avatar
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    Oh geeze, now it seems so obvious thanks.
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