COMBIN function
COMBIN(number,number_chosen) returns the number of combinations of a number of items, where number_chosen is number of items in each combination, i.e. the number of ways to choose some number of objects from a pool of a given size of objects
The number of combinations, where number =
$$ \binom{n}{k} = \frac{n!}{k!(n-k)!} $$
This is also known as the Binomial Coefficient.
- Numeric arguments are truncated to integers.
- The arguments cannot be negative.
- number_chosen must not be larger than number.