The pattern followed is, The place values for ‘SON’ are, S → 19, 19th letter from reverse is H O → 15, 15th letter from reverse is L N → 14, 14th letter from reverse is M Similarly, MASTER can be coded as, M → 13, 13th letter from reverse is N A → 26, 26th letter from reverse is Z S → 19, 19th letter from reverse is H T → 20, 20th letter from reverse is G E → 5, 5th letter from reverse is V R → 18, 18th letter from reverse is I MASTER is coded as ‘NZHGVI’ Hence, “NZHGVI” is the correct answer.