In this type of questions, a series of single, pairs or groups of letters or combinations of letters and numerals are given. The terms of the series form a certain pattern as regards the position of the letter in the English alphabet. Find the missing or wrong term in series 

1)

H, I, K, N, ?


A) O

B) Q

C) R

D) S

Answer:

Option C

Explanation:

$H + 1  \rightarrow I, I + 2 \rightarrow K, K + 3 \rightarrow N, N + 4\rightarrow R$

Hence the answer is (c).