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Black Book Advanced Problems in MathematicsMathematicsFunctions

Consider the function f : R - 1 R - 2 given by f(x) = 2x x - 1 . Then :

Options

  1. Af is one-one but not onto
  2. Bf is onto but not one-one
  3. Cf is neither one-one nor onto
  4. Df is both one-one and onto

Correct answer

D. f is both one-one and onto

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