Select the letter from among the given options that can replace the question mark (?) in the following series.
H, Q, I, T, K, ?, N
Answer & explanation
Correct answer: option 1

Explanation:
H, Q, I, T, K, ?, N
The logic followed here is :
H → (+1) → I, I → (+2) → K, K → (+3) → N
Q → (+3) → T, T → (+5) → Y
So, the letter-cluster that replaces the (?) to complete the series is "Y"