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Math Help - Problem - Combination or Permutation?

  1. #1
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    Canada
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    Question Problem - Combination or Permutation?

    Hello.

    I'm trying to find a formula to find the number of possible results.
    Items:
    • BLANK
    • _B
    • _I
    • _U
    • _Brd


    Order matters and no reputation. Looking for all unique possibilities.

    NAME (THIS NEVER CHANGES AND CAN BE IGNORED)
    1.58mm(1/16)_Op


    Example output:
    1.58mm(1/16)_Op
    1.58mm(1/16)_Op_B
    1.58mm(1/16)_Op_B_I


    I tried to write them all out and i think there is 14?

    Any
    help would be great.

    Thanks
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  2. #2
    Newbie
    Joined
    Oct 2012
    From
    Canada
    Posts
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    Re: Problem - Combination or Permutation?

    I think n = 5, 5! = 120. But "_B_I" is the same as "_I_B" and should be removed from count.
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