Direction to solve:

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 


<<12345>>
16.

Z, X, S, I, R, R, ?, ?


A) G, I

B) J, I

C) J, K

D) K, M



17.

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


A) G, H

B) P, G

C) R, G

D) S, R



18.

Z, Y,  X, U, T, S, P, O, N, K, ?, ?


A) H, G

B) H, I

C) I, H

D) J, I



19.

Z, W, S, P, L, I, E, ?


A) B

B) D

C) F

D) K



20.

PERPENDICULAR, ERPENDICULA, RPENDICUL, ?


A) PENDICUL

B) PENDIC

C) ENDIC

D) ENDICU

E) None of these



<<12345>>