Given series: Left side T H I S K D O W P A N E C M X U Z R B Right side 6th letter from the left side = D 12th letter from the right side of D As here both direction are used left and right so we can solve it as 6th letter from the left + 12th letter to the right of 6th letter = 18th letter from left (here total nineteen letters are there so we can count 2nd from the right also) So 18th letter from the left or 2nd from the right end will be R. Hence, R is the correct answer.