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Function Factorial(A, B) As Long
Dim S&
If A > B Then Factorial = 1: Exit Function
For i = 1 To A
  S = S + Factorial(A + 1, B)
Next i
Factorial = IIf(S = 0, 1, S)
End Function

Sub Test()
MsgBox Factorial(2, 6)
End Sub
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