Option Explicit
Sub cACHEcACHE()
Dim i As Byte
Dim NBparticipants As Byte
NBparticipants = ThisWorkbook.Worksheets(1).Range("AC3")
For i = 1 To ThisWorkbook.Worksheets.Count
If NBparticipants <= 10 Then ' <<<< à ajuster limite ..........
Select Case i
Case 4, 5, 6
ThisWorkbook.Worksheets(i).Visible = xlSheetHidden
End Select
Else
Select Case i
Case 4, 5, 6
ThisWorkbook.Worksheets(i).Visible = xlSheetVisible
End Select
End If
Next i
End Sub