Which letter cluster will replace the question mark (?) in the following series?
GW, JO, ?, VE, EC
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → OI
In a letter-cluster series, each position of the cluster follows its own rule, so each position is checked separately using the place of the letter in the alphabet. The count continues from A after Z and from Z before A.
First letters G (7), J (10): the gaps are +3, +5, +7, +9, so the missing letter is \(10+5=15\), that is O; then \(15+7=22\) gives V and \(22+9=31\), and \(31-26=5\) gives E, which match the given letters
Second letters W (23), O (15): the gaps are -8, -6, -4, -2, so the missing letter is \(15-6=9\), that is I; then \(9-4=5\) gives E and \(5-2=3\) gives C, which match the given letters
So the missing cluster is OI.