For all real numbers v, an operation is defined by the equation v* = v - v/3. If (v*)* = 4, then v=	Choices:
A) 6 B) 9 C) 12 D) 15 E) 18

Rationale: "( v * ) * = ( v - v / 3 ) - ( v - v / 3 ) / 3 4 = 2 v / 3 - 2 v / 9 = 4 v / 9 v = 9 the answer is b ."
Answer: B