GMAT Problem Solving

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Source: Manhattan

Level: 3

For which of the following functions f(x) is the relation f(f(x)) = f(f(f(f(x)))) NOT true for at least some values of x not equal to zero?

  • A f(x) = -|x|
  • B f(x) = 2-x
  • C f(x) = 3x
  • D
  • E f(x) = 5

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