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)

Y, W, T, P, K, E, X, ?, ?


A) G, H

B) P, G

C) R, G

D) S, R

Answer:

Option B

Explanation:

Y2W,W3T,T4P,

P5K,K6E,E7X,

X8P,P9G

Hence the answer is (b).