Find the letter-cluster that should fill the blank in the series: ABZ, BCY, CDX, DEW, ?
EEV
EFV
EFU
EFX
Correct answer: EFV
Solution
In the series, the first letters go A, B, C, D, so next is E. The second letters go B, C, D, E, so next is F. The last letters go Z, Y, X, W, so next is V.