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)

A, D, H, M, ?, Z


A) G

B) T

C) S

D) N

Answer:

Option C

Explanation:

$A + 3 \rightarrow D, D + 4 \rightarrow H, H + 5 \rightarrow M, M + 6 \rightarrow S, S + 7\rightarrow Z $

Hence the answer is (c).