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Black Book Advanced Problems in MathematicsMathematicsFunctions

If A = 1, 2, 3, 4 and f : A A , then total number of invertible function ' f ' such that f(2) 2 , f(4) 4, f(1) = 1 is equal to :

Options

  1. A1
  2. B2
  3. C3
  4. D4

Correct answer

C. 3

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