Series : AZ, BY, CX, DW, ? The pattern followed in each letter of the terms is : 1st letter : A (+1 letter) = B (+1 letter) = C (+1 letter) = D (+1 letter) = E 2nd letter : Z (-1 letter) = Y (-1 letter) = X (-1 letter) = W (-1 letter) = V Thus, missing term = EV