In a row of children, Anuj is 11th from the left and Vikas is 13th from the right. When they exchange their places, Anuj  will be 17th  from the left. Which of the following will be the new position of Vikas from the right?

19

Total number of students = position of vikas before interchange + position of anuj after interchange 

                                     = 13 +  17  - 1 = 29

Position of Vikas after interchange from right end =  30 - 11  = 19