A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.NO, QR, UV, ZA, ?

Let's track the pattern of the first letter of each pair:N (14) $\to$ Q (17): $+3$ Q (17) $\to$ U (21): $+4$ U (21) $\to$ Z (26): $+5$ Following this increasing difference ($+3,+4,+5,+6$), the next first letter will be: $26+6=32\to 32-26=6\to$ FNow let's check the second letter of each pair:O (15) $\to$ R (18): $+3$ R (18) $\to$ V (22): $+4$ V (22) $\to$ A (1 or 27): $+5$ The next second letter will be: $1+6=7\to$ GThus, the missing term is FG.