Thread: How to type the symbol for permutation?

like combination/choose, nCr is
what about for permutation, nPr?

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

Hello,

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

: _{n} P_{r}

Or sometimes : : P_{r}^{n}

Originally Posted by Moo

Hello,

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

: _{n} P_{r}

Or sometimes : : P_{r}^{n}

Yeah I think that Moo is correct...that is what I use to represent permuatation here

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

Why would they keep 2 symbols for the same representation

Perhaps some people don't know about the probability one but know about the polynomial one ? Or vice-versa ?