What should come in place of '?' in the given series in order to make it logically complete? JF125, KE64, MC27, PZ8, ?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete? FZK51, ZTE70, TNY89, NHS108, ?

Find the term that does NOT fit into the following series: F 6 Y, H 13 W, K 28 T, O 59 Q, T 122 K