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| ²q¤@²q ½Æ»s¥N½XSub zz()
Dim a
a = Range("b2:b" & [b1048576].End(3).Row)
For i = 1 To UBound(a)
    If a(i, 1) < 200 Or a(i, 1) > 280 Then a(i, 1) = Application.RandBetween(200, 280)
Next
[b2].Resize(i - 1) = a
End Sub
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