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In which sequence are terms decreasing by an equal amount but (d) is not (-4)?

Answer and explanation

Correct answer: \(45, 40, 35, 30, \ldots\)

In the sequence \(45, 40, 35, 30, \ldots\), each term is 5 less than the preceding term. Therefore, its common difference is \(d=40-45=-5\), not \(-4\). In contrast, each of the other three sequences has common difference \(-4\). Exam tip: Find the common difference by subtracting the first term from the second term: \(d=a_2-a_1\).

Related tags

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

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