What will come in place of question mark(?) in the following series?
X5C, U8F, ?, O17L, L23O

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
IJM 77, PQT 69, WXA 61, DEH 53, ?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
CER121, IKX98, OQD75, UWJ52, ?

What will come in place of question mark(?) in the following series?
X5C, U8F, ?, O17L, L23O

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
HMI 3, JOK 6, LQM 9, NSO 12, ?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
GIM 8, HJN 11, IKO 14, JLP 17, ?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
FOR 16, JIV 29, NCZ 42, RWD 55, ?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
ADB 1, EHF 4, ILJ 16, MPN 64, ?

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, ?