- #1

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## Main Question or Discussion Point

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]

[tex]n_P_r=\frac{n!}{(n-r)!}[/tex]

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- Thread starter temaire
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- #1

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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]

[tex]n_P_r=\frac{n!}{(n-r)!}[/tex]

- #2

cristo

Staff Emeritus

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You mean like this: [tex]n \choose r[/tex] or [tex]^n\mathrm{C}_r[/tex] ?

Last edited:

- #3

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Yes, that's what I meant, but I am used to writing down like this:

http://img88.imageshack.us/img88/7682/formula2nj1.png [Broken]

http://img88.imageshack.us/img88/7682/formula2nj1.png [Broken]

Last edited by a moderator:

- #4

cristo

Staff Emeritus

Science Advisor

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Ok, how about this then: [tex]_n\mathrm{C}_r \hskip5mm _n\mathrm{P}_r[/tex]

- #5

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Thanks, that's what I needed.

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