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:

$Y-2 \rightarrow W, W-3 \rightarrow T, T-4 \rightarrow P, $

$P-5 \rightarrow K, K-6 \rightarrow E, E-7 \rightarrow X,$

$X-8\rightarrow P, P-9 \rightarrow G $

Hence the answer is (b).