Select the letter-cluster that can replace the question mark (?) in the following series.
aYd, fTi, kOn, pJs, ?
Answer & explanation
Correct answer: option 4
Explanation:

Explanation:
aYd, fTi, kOn, pJs, ?
The logic followed here is :
a → (+5) → f → (+5) → k → (+5) → p → (+5) → u
Y → (-5) → T → (-5) → O → (-5) → J → (-5) → E
d → (+5) → i → (+5) → n → (+5) → s → (+5) → x
So, the letter-cluster that replaces the (?) to complete the series is "uEx'