Which letter cluster will replace the question mark (?) in the following series?
AB, BD, DH, GN, ?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → KV
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), D (4), G (7): the gaps are 1, 2, 3, so the gap grows by 1 and the next gap is 4: \(7+4=11\), that is K
Second letters B (2), D (4), H (8), N (14): the gaps are 2, 4, 6, so the gap grows by 2 and the next gap is 8: \(14+8=22\), that is V
So the missing cluster is KV.