Почему не работает функция Combin в VBA???

Excel Developer Reference
WorksheetFunction.Combin Method
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.
Syntax

expression.Combin(Arg1, Arg2)

expression A variable that represents a WorksheetFunction object.

Parameters

Name Required/Optional Data Type Description
Arg1 Required Double The number of items.
Arg2 Required Double The number of items in each combination.

Return Value
Double

Remarks

Numeric arguments are truncated to integers.
If either argument is nonnumeric, Combin generates an error.
If number < 0, number_chosen < 0, or number < number_chosen, Combin generates an error.
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.

т. е. надо правильно писать:
WorksheetFunction.Combin
а вы написали Application.Combin ))))