Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
PET 23, TJN 32, XOH 41, BTB 50, ?

Given: PET 23, TJN 32, XOH 41, BTB 50, ?

Logic: 1st letter + 4, 2nd letter + 5, 3rd letter - 6 and number + 9 place.

For, 1st letter

P + 4 = T, T + 4 = X, X + 4 = B, B + 4 = F

For, 2nd letter

E + 5 = J, J + 5 = O, O + 5 = T, T + 5 = Y

For, 3rd letter
T - 6 = N, N - 6 = H, H - 6 = B, B - 6 = V

For, number

23 + 9 = 32, 32 + 9 = 41, 41 + 9 = 50, 50 + 9 = 59

So, the missing term is FYV 59.

Thus, correct option is (b).