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Black Book Advanced Problems in MathematicsMathematicsFunctions

If A = 1, 2, 3, 4 , B = 1, 2, 3, 4, 5, 6 and f : A B is an injective mapping satisfying f(i) i , then number of such mappings are :

Options

  1. A182
  2. B181
  3. C183
  4. Dnone of these

Correct answer

B. 181

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