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With first term 6 and common difference 3, the first four terms are:

A3, 6, 9, 12
B6, 12, 18, 24
C6, 9, 12, 15
D6, 3, 0, minus 3
Answer & Solution
Correct answer: C. 6, 9, 12, 15
1. Start at 6. 2. Add 3 each time. 3. The terms are 6, 9, 12, 15. _Source: syllabus Mathematics, Chapter 5, Arithmetic Progressions._
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