Which letter cluster will replace the question mark (?) in the following series?
WIQ, SEM, OAI, ?, GSA
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → KWE
Each position of the cluster is checked on its own. Here every letter moves 4 places back; when the count goes back past A, it continues from Z.
First letters W (23), S (19), O (15): 4 places back each time, so the missing letter is \(15-4=11\), K, and \(11-4=7\) gives G, which matches the last term
Second letters I (9), E (5), A (1): 4 places back each time; 4 places back from A are Z, Y, X, W, and 4 places back from W (23) is S (19), which matches the last term
Third letters Q (17), M (13), I (9): 4 places back each time, so the missing letter is \(9-4=5\), E, and \(5-4=1\) gives A, which matches the last term
So the missing cluster is KWE.