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Public Class Form1
Dim a() As Integer
Dim i =0
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim p As Integer
Dim f = 1
Dim k As Integer
Do While f
f = 0
p = Int((10 - 0 + 1) * Rnd() + 0)
k = 0
If i >= 1 Then
Do While k < i
If p = a(k) Then
f = 1
Exit Do
End If
k = k + 1
Loop
End If
Loop
i = i + 1
ReDim a(i)
a(i - 1) = p
RichTextBox1.AppendText(p & vbCrLf)
End Sub
End Class