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What will be the common difference in (42,36,30,24,\ldots)?

Answer and explanation

Correct answer: -6

The common difference is found by subtracting a term from the next term: \(36-42=-6\). Also, \(30-36=-6\) and \(24-30=-6\), so the common difference is \(-6\). Option 6 ignores the sign; in a decreasing AP, the common difference is negative. Exam tip: always calculate \(a_2-a_1\) in this order to get the correct sign.

Related tags

Arithmetic ProgressionCommon DifferenceNegative DifferenceClass 10 MathematicsAp BasicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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