Maths-
General
Easy

Question

A function f from integers to integers is defined as f left parenthesis x right parenthesis equals open curly brackets table row cell n plus 3 blank n element of o d d end cell row cell n divided by 2 blank n element of text end text text e end text text v end text text e end text text n end text text end text end cell end table text  suppose  end text k element of text  odd  end text close text  and end text f left parenthesis f left parenthesis f left parenthesis k right parenthesis right parenthesis right parenthesis equals 27 text end textthen the sum of digits k is

  1. 3    
  2. 6    
  3. 9    
  4. 12    

The correct answer is: 6

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