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What is the common difference in the sequence (100,90,80,70,\ldots)?

Answer and explanation

Correct answer: -10

To find the common difference, subtract a term from the term immediately before it: \(90-100=-10\). Therefore, the correct answer is \(-10\). Option A gives only the magnitude of the difference, but a decreasing sequence has a negative common difference. Exam tip: calculate second term − first term using any two consecutive terms.

Related tags

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

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