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If a, b and c are in a progression, then b equals:

Aa minus c, over 2
Ba plus c, over 2
Ca plus c, over 3
Da times c, over 2
Answer & Solution
Correct answer: B. a plus c, over 2
1. The middle term sits halfway between the others. 2. Its distance to each side is equal. 3. So b is a plus c divided by 2. _Source: syllabus Mathematics, Chapter 5, Arithmetic Progressions._
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