Number of points where \( f(x)=[x / 3], x \in[0,30] \) is discontinuous is/are (where [.] repres...

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Number of points where \( f(x)=[x / 3], x \in[0,30] \) is discontinuous is/are (where [.] represents the greatest integer function)
(A) 11
(B) 9
(C) 10
(D) 12
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