Select the letter-cluster that can replace the question mark (?) in the following series.
YZT, WXR, UVP, ?
Answer & explanation
Correct answer: option 4

Explanation:
YZT, WXR, UVP, ?
The logic followed here is :
Y → (-2) → W → (-2) → U → (-2) → S
Z → (-2) → X → (-2) → V → (-2) → T
T → (-2) → R → (-2) → P → (-2) → N
So, the letter-cluster that replaces the (?) to complete the series is "STN"