⭐ Important points (exam-critical)
- ⭐Duplicate ratio of a:b = a²:b². Sub-duplicate = √a:√b.
- ⭐Watch unit consistency — convert to same unit before forming ratio.
- ⭐Antilog: anti(log x) = 10ˣ for common log.
- ⭐ICAI loves 2-mark direct application MCQs from log tables.
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