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The COMBIN function in Excel is used to calculate the number of combinations for a given number of items. It returns the number of combinations for a given number of objects and the number of objects to be chosen at a time.
The syntax for the COMBIN function is as follows: COMBIN(number, number_chosen)
Where:
· number: the total number of objects to choose from
· number_chosen: the number of objects to choose
For example, if you want to calculate the number of combinations of 10 objects taken 2 at a time, you would use the following formula:
Note that the order of the objects does not matter in a combination, and that repetitions are not allowed. If repetitions are allowed, you should use the COMBINATIONS function instead.