Which pair of letters will fill the blank in the given series?
EQ, FS, HV, KZ, ____, TK
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → OE
In a series of letter pairs, each place in the pair follows its own rule. Here the steps grow by one each time, and after Z the count goes round to A again.
First letters E (5), F (6), H (8), K (11): steps \(+1, +2, +3\), so the next step is \(+4\): \(11+4=15\), which is O
Check with the last pair: O (15) \(+5=20\), which is T, as given
Second letters Q (17), S (19), V (22), Z (26): steps \(+2, +3, +4\), so the next step is \(+5\): \(26+5=31\), and \(31-26=5\), which is E
Check with the last pair: E (5) \(+6=11\), which is K, as given
So the missing pair is OE.