Select the option that can replace the question mark (?) in the following series.

Z5LW, W7OY, T9RB, Q11UF, ?

Logic: 1st letter is decreasing - 3, 3rd letter is increasing + 3, number is increasing + 2 and 4th letter is increasing +2, +3, +4, +5,...

Z → W → T → Q → ?

Z → W (-3),W → T (-3), T → Q (-3), Q → N (-3)

So, the first letter of the missing term is N.

5, 7, 9, 11, ?

5 → 7 (+2), 7 → 9 (+2), 9 → 11 (+2), 11 → 13 (+2)

So, the number in the missing term is 13.

L → O → R → U → ?

L → O (+3), O → R (+3), R → U (+3), U → X (+3)

So, the third letter in the missing term is X.

W → Y → B → F → ?

W → Y (+2), Y → B (+3), B → F (+4), F → K (+5)

So, the fourth letter in the missing term is K.

The missing term isN13XK.

Thus, correct option is (b).