The COMBIN function 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.

COMBIN takes 2 required arguments and no optional arguments:

Syntax: COMBIN(number, number_chosen)

#1)
Using the COMBIN function:
#2)
The arguments for the COMBIN function are:
Argument Required? Description
number Required The number of items.
number_chosen Required The number of items in each combination.
#3)
A couple things:
Numeric arguments are truncated to integers.
If either argument is nonnumeric, COMBIN returns the #VALUE! 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.

Summary

The COMBIN function 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.
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