Revision
Public Sub ProcessData()
Const TEST_COLUMN As String = "A" '<=== change to suit
Dim i As Long
Dim iLastRow As Long
Dim rng As Range
With ActiveSheet
iLastRow = .Cells(.Rows.Count, TEST_COLUMN).End(xlUp).Row
For i = 1 To iLastRow
If .Evaluate("SUMPRODUCT(--(A" & i & ":A" & iLastRow & "=A" & i & ")," & _
"--(B" & i & ":B" & iLastRow & "=B" & i & ")," & _
"--(C" & i & ":C" & iLastRow & "=C" & i & "))") > 1 Then
If rng Is Nothing Then
Set rng = .Cells(i, "A").Resize(, 3)
Else
Set rng = Union(rng, .Cells(i, "A").Resize(, 3))
End If
End If
Next i
If Not rng Is Nothing Then rng.Delete
End With
End Sub