How do I call an Excel Function (COMBIN) from my user created function?

I pass 4 variables to a VBA function, and from them calculate 8 dependent variables from which I need to calculate and pass back to the Excel cell:

FName = ( Combin(n1,n2) * Combin(n3,n4 ) +  ( Combin(n5,n6) * Combin(n7,n8 ) )

One by one I can return n1 - n8 and the numbers are correct, but I can't even get constants to work:  i.e.  FName  =  Combin(5,3)

Err: (With "Combin" hi-lited):   Compile error: Sub or Function not defined

Any help with syntax will be greatly appreciated.

- Ed
LVL 3
Ed CovneyRetiredAsked:
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GrahamSkanRetiredCommented:
Try it like this

With Application.WorksheetFunction
    Fname = .Combin(n1, n2) * .Combin(n3, n4) + .Combin(n5, n6) * .Combin(n7, n8)
End With

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Ed CovneyRetiredAuthor Commented:
Graham -

I tried it and I like it !!!

Thank you, thank you, thank you.

- Ed
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