Complete the series by replacing the question mark:
ABD, DGK, HMS, MTB, ?
Show Hint
For letter sequences, identify how each letter changes across positions (e.g., increments of 3, 5, and 7) and apply the pattern to complete the series.
Look at the sequence:
First letters: A → D → H → M → S (increment by 3 positions).
Second letters: B → G → S → T → B (increment by 5 positions).
Third letters: D → K → M → B → L (increment by 7 positions).
Hence, the next term in the sequence is \( \boxed{SBL} \).