Permutation And Combination method in MathJax using Asscii Code

Question

Need a Permutation And Combination mathJaX symbol for the nCr and nPr

user_8601004 · Answer

You can use this:

nCk => {}_n \mathrm{ C }_k

nPk => {}_n \mathrm{ P }_k

user_11932264 · Answer

You can use {n \choose r} or \binom{n}{r}