# COMBIN

### Definition of COMBIN

Returns the number of ways to choose some number of objects from a pool of a given size of objects.

### Sample Usage

`COMBIN(4,2)`

`COMBIN(A2,B2)`

### Syntax

`COMBIN(n, k)`

`n`

- The size of the pool of objects to choose from.`k`

- The number of objects to choose.

### Notes

`COMBIN`

is the standard combinatorics function typically notated nCk and read "n choose k". This is equivalent to`FACT(n)/(FACT(k)*FACT(n-k))`

.

### See Also

`MULTINOMIAL`

: Returns the factorial of the sum of values divided by the product of the values' factorials.

`FACTDOUBLE`

: Returns the "double factorial" of a number.

`FACT`

: Returns the factorial of a number.

### To use the COMBIN Formula, simply begin with your edited Excellentable:

### Then begin typing the COMBIN formula in the area you would like to display the outcome:

### By adding the values you would like to calculate, Excellentable generates the outcome: