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What is the common difference in (9, 9, 9, 9, …)?

Answer and explanation

Correct answer: 0

For an arithmetic progression, the common difference is obtained by subtracting one term from the next, for example d = a₂ − a₁. In this sequence the first two terms are both 9, so d = 9 − 9 = 0. The same result is obtained from every consecutive pair because each term equals the next term. A constant sequence is therefore a valid arithmetic progression with zero common difference; an AP does not have to increase or decrease. Option A confuses a term with the difference. Option B would apply to a sequence that increases by one each time, and option D would represent a decrease of nine at each step. Thus option C is correct.

Related tags

Arithmetic ProgressionZero Common DifferenceConstant SequenceIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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