अक्षर शृंखला में लुप्त पद (?) ज्ञात कीजिये: AC, DG, HL, ? , SY, ..............

The first letters A, D, H, ?, S advance by 3, 4, 5, 6, so the missing one is M. In each pair the second letter is 2, 3, 4, 5, 6 places ahead of the first (A→C, D→G, H→L, M→R, S→Y). The term is MR.