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What is the common difference of (15,12,9,6,\ldots)?

Answer and explanation

Correct answer: -3

The common difference of an arithmetic progression is the difference between two consecutive terms: second term − first term. Here, \(d=12-15=-3\), and the same value is obtained from \(9-12=-3\) and \(6-9=-3\). Therefore, option B, \(-3\), is correct. Since the progression is decreasing, its common difference is negative; writing only its magnitude, \(3\), would be incorrect. Exam tip: calculate \(a_2-a_1\) or subtract any term from the term immediately following it.

Related tags

Arithmetic ProgressionCommon DifferenceDecreasing SequenceClass 10 MathematicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions Ap

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