Which letter-cluster will replace the question mark (?) in the following letter series? TWZ, VYB, XAD, ?AADGBYBECZBEDZCFAnswer: D. ZCF Read Explanation: T + 2 = V W + 2 = Y Z + 2 = B V + 2 = X Y + 2 = A B + 2 = D So, X + 2 = Z A + 2 = C D + 2 = FRead more in App