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Excel: Generate Unique Random Numbers

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This UDF will generate x unique random numbers between any 2 numbers you specify. Many thanks to J.E. McGimpsey for modifying this to work on more than 10 numbers.

The Code

Function RandLotto(Bottom As Integer, Top As Integer, _
                    Amount As Integer) As String
    Dim iArr As Variant
    Dim i As Integer
    Dim r As Integer
    Dim temp As Integer
    
    Application.Volatile
    
    ReDim iArr(Bottom To Top)
    For i = Bottom To Top
        iArr(i) = i
    Next i
    
    For i = Top To Bottom + 1 Step -1
        r = Int(Rnd() * (i - Bottom + 1)) + Bottom
        temp = iArr(r)
        iArr(r) = iArr(i)
        iArr(i) = temp
    Next i
    
    For i = Bottom To Bottom + Amount - 1
        RandLotto = RandLotto & " " & iArr(i)
    Next i
    
    RandLotto = Trim(RandLotto)
    
End Function

To use this UDF push Alt+F11 and go Insert>Module and paste in the code. Push Alt+Q and save. The Function will appear under "User Defined" in the Paste Function dialog box (Shift+F3). Use the Function in any cell as shown below.

=RandLotto(1,20,8)
This would produce 8 unique random numbers between 1 and 20

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