# COMBIN

Returns the number of combinations for a given number of items. Use COMBIN to determine the total possible number of groups for a given number of items.

**Syntax**

**COMBIN**(**number**,**number_chosen**)

**Number** is the number of items.

**Number_chosen** is the number of items in each combination.

**Remarks**

- Numeric arguments are truncated to integers.
- If either argument is nonnumeric, COMBIN returns the #NAME? error value.
- If number < 0, number_chosen < 0, or number < number_chosen, COMBIN returns the #NUM! error value.
- A combination is any set or subset of items, regardless of their internal order. Combinations are distinct from permutations, for which the internal order is significant.
- The number of combinations is as follows, where number = n and number_chosen = k:
where:

**Example**

Suppose you want to form a two-person team from eight candidates, and you want to know how many possible teams can be formed. `COMBIN(8, 2)`

equals 28 teams.