Mohan is 13th from the left end in a row of children. Prabir is 12th from the right end and 18th from the left end. How many children are towards the right of Mohan in that row?

None of these

Total = Prabir Left Rank + Prabir Right Rank - 1

Total = 12 + 18 - 1 = 29

Total = Mohan Left Rank + Mohan Right Rank - 1

29 = 13 + R - 1

R = 17

Mohan's  position from Right side = 17 

Number of persons sitting to right of Mohan = 17 - 1 = 16