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Which option represents an arithmetic progression with a = 9 and d = 3?

Answer and explanation

Correct answer: 9, 12, 15, 18, ...

Answer: 9, 12, 15, 18, ..., so option B is correct. In the notation of an arithmetic progression, a is the first term and d is the common difference between consecutive terms. We must check both conditions, not just one. Option B begins with 9, so its first term is a = 9. Its differences are 12 - 9 = 3, 15 - 12 = 3, and 18 - 15 = 3. Therefore it has both the required first term and the required common difference. Option A has difference 3, but it starts with 3 rather than 9. Option C starts with 9, but its difference is 2, not 3. Option D has difference 3, but its first term is 12. Thus only B satisfies the complete requirement. A common confusion is to identify a sequence merely because its difference is correct; always verify the first term too.

Related tags

Arithmetic ProgressionFirst TermCommon DifferenceSequenceIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions Ap

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