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What is the common difference in the sequence (3a,3a-4,3a-8,\ldots)?

Answer and explanation

Correct answer: -4

The common difference is found by subtracting a term from the term immediately after it. Here, \(d=(3a-4)-3a=-4\). Also, \((3a-8)-(3a-4)=-4\), confirming that the common difference is \(-4\). The number \(4\) is only the magnitude of the difference; for a decreasing AP, the common difference is negative. Exam tip: Write \(d=a_2-a_1\) and check the sign carefully.

Related tags

Arithmetic ProgressionCommon DifferenceAlgebraic SequenceNegative DifferenceClass 10 MathematicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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