COMBINA Returns the number of combinations (with repetitions) for a given number of items.
Syntax
COMBINA(number, number_chosen)
Parameters
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.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference