Sequence Analogy — Constant difference progression: (12, 20, 28) → ____

Introduction / Context:
(12, 20, 28) forms an arithmetic progression with common difference +8. We need a triple that is also an arithmetic progression with a constant difference (not necessarily +8, but consistent).

Concept / Approach:
Check options: (18, 30, 42) has +12 and +12, so it mirrors the AP structure.

Why Other Options Are Wrong:
They do not maintain a constant difference throughout.

Final Answer:
(18, 30, 42)