Which letter-cluster will replace the question mark (?) in the following letter series?
TWZ, VYB, XAD,?
Answer & explanation
Correct answer: option 4
Explanation:

Explanation:
TWZ, VYB, XAD,?
The logic followed here is :
T → (+2) → V → (+2) → X → (+2) → Z
W → (+2) → Y → (+2) → A → (+2) → C
Z → (+2) → B → (+2) → D → (+2) → F
So, the letter-cluster that replaces the (?) to complete the series is "ZCF'