সিরিজের অনুপস্থিত (?) পদটি সন্ধান করুন। AB, CE, FI, ?, OT A. JM B. GK C. HO D. JN

The gap between the two letters grows by 1 each time: A→B (+1), C→E (+2), F→I (+3), so next comes +4, and O→T (+5). Each term also starts one letter after the previous term ends: B → C, E → F, I → J. So the missing term is J→N, i.e. JN.