Select the letter cluster that will replace the question mark (?) in the following series.
WYB, XUD, YQF, ?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → ZMH
In a letter-cluster series, the first, second and third letters each follow their own rule, so each position is checked separately using the place of the letter in the alphabet.
First letters W (23), X (24), Y (25): 1 place ahead each time, so the next is \(25+1=26\), that is Z
Second letters Y (25), U (21), Q (17): 4 places back each time, so the next is \(17-4=13\), that is M
Third letters B (2), D (4), F (6): 2 places ahead each time, so the next is \(6+2=8\), that is H
So the missing cluster is ZMH.