Select the option that can replace the question mark (?) in the following series. 16S8, 33M12, 50G18, 67A26, ?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete? IQX33, LTA49, OWD65, RZG81, ?

Find the missing term in the given series: L3T, ?, F8P, C12N

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete? GLR111 , QVB94 , AFL77 , KPV60 , ?