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Which sequence is an arithmetic progression?

Answer and explanation

Correct answer: (5,10,15,20,\ldots)

The direct answer is option C, \(5,10,15,20,\ldots\). An arithmetic progression has a constant difference between consecutive terms. For option C, \(10-5=5\), \(15-10=5\), and \(20-15=5\), so the common difference is 5. Option A doubles each time: differences are 2 and 4, so they are not constant. Option B contains square numbers; its differences are 3, 5, and 7, so it is not an AP. Option C has equal differences and is correct. Option D also doubles: differences are 3, 6, and 12, so it is not an AP. Do not confuse a constant ratio with a constant difference; doubling describes a geometric pattern, not an arithmetic one. Memory cue: subtract neighbouring terms; if every answer is the same, it is an AP.

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Arithmetic-ProgressionIdentify-ApClass10

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