# COMBINA

Returns the number of combinations (with repetitions) for a given number of items.

## Syntax

COMBINA(number, number_chosen)


### Parameters

Term Definition
number Must be greater than or equal to 0, and greater than or equal to Number_chosen. Non-integer values are truncated.
number_chosen Must be greater than or equal to 0. Non-integer values are truncated.

## Return value

Returns the number of combinations (with repetitions) for a given number of items.

## Remarks

• If the value of either argument is outside of its constraints, COMBINA returns the #NUM! error value.

• If either argument is a non-numeric value, COMBINA returns the #VALUE! error value.

• The following equation is used, where $N$ is Number and $M$ is Number_chosen:

$${N+M-1 \choose N-1}$$

• This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

## Example

Formula Description Result
= COMBINA(4,3) Returns the number of combinations (with repetitions) for 4 and 3. 20
= COMBINA(10,3) Returns the number of combinations (with repetitions) for 10 and 3. 220