Visual Basic - Finding Array Duplicate Help

I have this one array and what I am trying to do is find after how many numbers is there a duplicate number. So if a list is:

5
4
6
3
5

Then it should display that the duplicate happens after 4 numbers.

Here's my code:

Option Explicit


Dim ind As Integer
Dim arrays() As Integer
Dim size As Integer
Dim i As Integer



Private Sub Form_Load()
Randomize
size = 5

ReDim arrays(size)
For ind = LBound(arrays) To UBound(arrays)
    arrays(ind) = Int(size * Rnd + 1)
        
Next ind


For ind = LBound(arrays) To UBound(arrays)
    List1.AddItem arrays(ind)
Next ind

Code (markup):

 

Would this be what you need?

(add a button and paste the code)

Private Sub Command1_Click()
    Dim i As Long
    Dim k As Long
    Dim itemvalue As String
    For i = 0 To List1.ListCount - 1
        itemvalue = List1.List(i)
        For k = i + 1 To List1.ListCount - 1
            If List1.List(k) = itemvalue Then
                MsgBox "Duplicate of item#" & CStr(i) & " found after " & CStr(k - i) & " items"
                Exit For
            End If
        Next k
    Next i
End Sub

Code (markup):