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Math Help - Permutations

  1. #1
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    Permutations

    Hi every one

    I have ABCDEF++/-

    how to calculate number of permutations when the first and second element
    must begin with a letter and also we can use a letter one time in each permutation

    thanks
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  2. #2
    Senior Member BAdhi's Avatar
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    how far have you gone, show what you've tried please
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  3. #3
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    Quote Originally Posted by shayw View Post
    I have ABCDEF++/-
    how to calculate number of permutations when the first and second element must begin with a letter and also we can use a letter one time in each permutation
    This is a vague question.
    Do you mean that all eight symbols are use in each arrangement?
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  4. #4
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    Sorry didn't explain clearly
    I have 11 symbols (6 letters ABCDEF and +-*/^)
    in each arrangement i use the 11 symbols but the first and second symbol must begin with a letter
    eg AB+-CD*/EF^
    so i try this
    for 9 symbols i have 9! and for the for the first and second symbol 6*5
    so 6*5 * 9!
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  5. #5
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    Quote Originally Posted by shayw View Post
    Sorry didn't explain clearly
    I have 11 symbols (6 letters ABCDEF and +-*/^)
    in each arrangement i use the 11 symbols but the first and second symbol must begin with a letter: eg AB+-CD*/EF^
    so i try this for 9 symbols i have 9! and for the for the first and second symbol 6*5 so 6*5 * 9!
    That answer is correct.
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