# Math Help - How to type the symbol for permutation?

1. ## How to type the symbol for permutation?

like combination/choose, nCr is $n \choose r$
what about for permutation, nPr?

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

2. Hello,

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

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

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

3. Originally Posted by Moo
Hello,

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

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

Or sometimes : $P_{r}^{n}$ : P_{r}^{n}
Yeah I think that Moo is correct...that is what I use to represent permuatation here

4. For "choose" , I generally use $$n \choose r$$.
However there is an alternative, which Plato uses:$${\binom{n}{r}}$$ which also gives ${\binom{n}{r}}$

Why would they keep 2 symbols for the same representation

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