Maths-
General
Easy

Question

A mapping f colon N not stretchy rightwards arrow N , where N is the set of natural numbers is defined as f left parenthesis n right parenthesis equals open curly brackets table attributes columnspacing 1em end attributes row cell n squared comma text  for  end text n text  odd  end text end cell row cell 2 n plus 1 comma text  for  end text n text  even  end text end cell end table close For n element of N Then, f is

  1. Surjective but not injective
  2. Injective but not surjective
  3. Bijective
  4. Neither injective nor surjective

The correct answer is: Neither injective nor surjective


    Since, f left parenthesis n right parenthesis equals open curly brackets table attributes columnspacing 1em end attributes row cell n squared comma text  if  end text n text  odd  end text end cell row cell 2 n plus 1 comma text  if  end text n text  is even  end text end cell end table close
    table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell f left parenthesis 1 right parenthesis equals 1 squared equals 1 f left parenthesis 2 right parenthesis equals 2 left parenthesis 2 right parenthesis plus 1 equals 5 end cell row cell f left parenthesis 3 right parenthesis equals 3 squared equals 9 f left parenthesis 4 right parenthesis equals 2 left parenthesis 4 right parenthesis plus 1 equals 9 end cell row cell therefore f left parenthesis 3 right parenthesis equals f left parenthesis 4 right parenthesis end cell end table
    therefore f is not injective.
    Also, f is not surjective as every element of N is not the image of any element of N

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