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What is the common difference in the arithmetic progression (25,20,15,10,\ldots)?

Answer and explanation

Correct answer: -5

The common difference of an arithmetic progression is found by subtracting a term from the term immediately before it. Here, \\(20-25=-5\\) and \\(15-20=-5\\), so the common difference is \\(-5\\). Option A has the wrong sign; a decreasing progression has a negative common difference. Exam tip: subtract consecutive terms and always check the sign.

Related tags

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

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