Which letter cluster will replace the question mark (?) to complete the given series?
AZBY, BYCX, CXDW, ? , EVFU
Answer & explanation
Correct answer: option 1

Explanation:
AZBY, BYCX, CXDW, ? , EVFU
The logic followed here is :
A → (+1) → B → (+1) → C → (+1) → D → (+1) → E
Z → (-1) → Y → (-1) → X → (-1) → W → (-1) → V
B → (+1) → C → (+1) → D → (+1) → E → (+1) → F
Y → (-1) → X → (-1) → W → (-1) → V → (-1) → U
So, the letter-cluster that replaces the (?) to complete the series is "DWEV"