Series : ENG, GQI, ITK, KWM, ? The pattern followed in each letter of the terms is : 1st letter : E (+2 letters) = G (+2 letters) = I (+2 letters) = K (+2 letters) = M 2nd letter : N (+3 letters) = Q (+3 letters) = T (+3 letters) = W (+3 letters) = Z 3rd letter : G (+2 letters) = I (+2 letters) = K (+2 letters) = M (+2 letters) = O Thus, missing term = MZO