Which letter cluster will replace the question mark (?) in the following series?
AB, BD, CF, DH, ?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → EJ
In a letter-cluster series the first and second letters each follow their own rule, so each position is checked separately using the place of the letter in the alphabet.
First letters A (1), B (2), C (3), D (4): 1 place ahead each time, so the next is \(4+1=5\), that is E
Second letters B (2), D (4), F (6), H (8): 2 places ahead each time, so the next is \(8+2=10\), that is J
So the missing cluster is EJ.