Series : SUN, TWQ, UYT, VAW, ? The pattern followed in each letter of the terms is : 1st letter : S (+1 letter) = T (+1 letter) = U (+1 letter) = V (+1 letter) = W 2nd letter : U (+2 letters) = W (+2 letters) = Y (+2 letters) = A (+2 letters) = C 3rd letter : N (+3 letters) = Q (+3 letters) = T (+3 letters) = W (+3 letters) = Z Thus, missing term = WCZ