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COMBIN

The COMBIN function returns the number of dierent ways you can combine a

number of items into groups of a specic size, ignoring the order within the groups.

COMBIN(total-items, group-size)

Â total-items: The total number of items. total-items is a number value and must be

greater than or equal to 0. If total-items has a decimal (fractional) part, it is ignored.

Â group-size: The number of items combined in each group. group-size is a number

value and must be greater than or equal to 0. If group-size has a decimal (fractional)

part, it is ignored.

Usage Notes

Combinations are not the same as permutations. The order of the items in a group is Â

ignored for combinations but not for permutations. For example, (1, 2, 3) and (3, 2, 1)

are the same combination but two unique permutations. If you want the number of

permutations rather than the number of combinations, use the PERMUT function.

Examples

=COMBIN(3, 2) returns 3, the number of unique groups you can create if you start with 3 items and

group them 2 at a time.

=COMBIN(3.2, 2.3) returns 3. Fractional parts are dropped.

=COMBIN(5, 2) and =COMBIN(5, 3) both return 10.