# Excel COMBIN Function

The Excel COMBIN function returns the number of combinations for a given number of items. The COMBIN function *does not* allow repetitions. To count combinations that *allow* repetitions, use the COMBINA function.

**number**- The total number of items.**number_chosen**- The number of items in each combination.

The COMBIN function returns the number of combinations for a given number of items. A combination is a group of items where order *does not* matter. The COMBIN function *does not* allow repetitions. To count combinations that *allow* repetitions, use the COMBINA function. To count *permutations* (combinations where order does matter) see the PERMUT function.

### Example

To use COMBIN, specify the total number of items and "number chosen", which represents the number of items in each combination. For example, to calculate the number of 3-number combinations, you can use a formula like this:

=COMBIN(10,3) // returns 120

The *number* argument is 10 since there are ten numbers between 0 and 9, and number_chosen is 3, since there are three numbers chosen in each combination. This result can be seen in cell D8 in the example shown.

The COMBIN function takes two arguments: *number*, and *number_chosen*. *Number* is the number of different items available to choose from. The *number_chosen* argument is the number of items in each combination. Both arguments are required.

In the example shown above, the formula in cell D6, copied down, is:

=COMBIN(B6,C6)

At each new row, COMBIN calculates returns the number of combinations using the values in column B for *number*, and the values in column C for *number_chosen*. The results can be seen in column D.

### Notes

- A combination is a group of items in any order. If order matters, use the PERMUT function.
- Arguments that contain decimal values are truncated to integers.
- COMBIN returns a #VALUE! error value if either argument is not numeric.
- If
*number*is less than*number_chosen*, COMBIN returns #NUM!

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