Option Explicit
Sub ChonSoNgau()
Dim Rng As Range, sRng As Range
Dim Tmp As Integer, Dm As Long
Set Rng = [B3].Resize(10, 10)
Rng.Interior.ColorIndex = 2
Randomize
Do
Dm = Dm + 1
Tmp = 100 * Rnd() \ 1
Set sRng = Rng.Find(Tmp, , xlFormulas, xlWhole)
If Not sRng Is Nothing Then
sRng.Interior.ColorIndex = 38
[B1].Value = "Só Làn: ": [C1].Value = Dm
Exit Do
End If
Loop
End Sub