Question : Directions: Select the option that can replace the question mark (?) in the following series.
NB, OA, PZ, QY, ?
Option 1: RX
Option 2: WR
Option 3: RW
Option 4: RS
Correct Answer: RX
Solution :
Given:
NB, OA, PZ, QY, ?
Add 1 in the first letter and subtract 1 from the second letter, to obtain the required missing term –
NB→N + 1 = O, B – 1 = A→OA
OA→O + 1 = P, A – 1 = Z→PZ
PZ→P + 1 = Q, Z – 1 = Y→QY
QY→Q + 1 = R, Y – 1 = X→RX
So, the required missing term in the series is RX. Hence, the first option is correct.
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