Which letter-cluster will replace the question mark (?) to complete the given series?
WGPR, UDLM, ?, QXDC, OUZX
Answer & explanation
Correct answer: option 1

Explanation:
WGPR, UDLM, ?, QXDC, OUZX
The logic followed here is :
W → (-2) → U → (-2) → S → (-2) → Q → (-2) → O
G → (-3) → D → (-3) → A → (-3) → X → (-3) → U
P → (-4) → L → (-4) → H → (-4) → D → (-4) → Z
R → (-5) → M → (-5) → H → (-5) → C → (-5) → X
So, the letter-cluster that replaces the (?) to complete the series is "SAHH"