# What does it mean

when you have two numbers that look almost like a fraction (except without the line in the middle), surrounded by parentheses?

LCKurtz
Homework Helper
Gold Member
when you have two numbers that look almost like a fraction (except without the line in the middle), surrounded by parentheses?

You may be describing a binomial coefficient:

$$\binom n k = \frac {n!}{k!(n-k)!}$$

Damnit! I was too slow (took me a while to remember the English)!

Anyway...here it is Binomial Coefficient

Resolved, thanks y'all.