like combination/choose, nCr is $\displaystyle n \choose r$

what about for permutation, nPr?

I can't seem to find the code for it. Thanks!

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- Apr 26th 2008, 07:09 AMzepherHow to type the symbol for permutation?
like combination/choose, nCr is $\displaystyle n \choose r$

what about for permutation, nPr?

I can't seem to find the code for it. Thanks! - Apr 26th 2008, 07:14 AMMoo
Hello,

I've went to wikipedia, so excuse me if it doesn't correspond to the writing you know..

$\displaystyle _{n} P_{r}$ : _{n} P_{r}

Or sometimes : $\displaystyle P_{r}^{n}$ : P_{r}^{n} - Apr 26th 2008, 08:11 AMMathstud28
- Apr 26th 2008, 08:21 AMIsomorphism
For "choose" , I generally use [tex]n \choose r [/tex].

However there is an alternative, which Plato uses:[tex]{\binom{n}{r}} [/tex] which also gives $\displaystyle {\binom{n}{r}} $

Why would they keep 2 symbols for the same representation(Wondering) - Apr 26th 2008, 08:35 AMMoo
Perhaps some people don't know about the probability one but know about the polynomial one ? Or vice-versa ? :D