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Latex Formula

  1. May 14, 2008 #1
    How do you write the permutation and combination formulas using latex. This is the best I can do:

    [tex]n_P_r=\frac{n!}{(n-r)!}[/tex]
     
  2. jcsd
  3. May 14, 2008 #2

    cristo

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    You mean like this: [tex]n \choose r[/tex] or [tex]^n\mathrm{C}_r[/tex] ?
     
    Last edited: May 14, 2008
  4. May 14, 2008 #3
    Yes, that's what I meant, but I am used to writing down like this:

    [​IMG]
     
  5. May 14, 2008 #4

    cristo

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    Ok, how about this then: [tex]_n\mathrm{C}_r \hskip5mm _n\mathrm{P}_r[/tex]
     
  6. May 14, 2008 #5
    Thanks, that's what I needed.:smile:
     
  7. May 14, 2008 #6
    Out of curiosity, are you good at perms. and combs.? Because I have a question on the the Precalc. forum that hasn't been answered yet. If not, it's ok, because I can wait.
     
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