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Which sequence is an arithmetic progression with common difference −4?

Answer and explanation

Correct answer: 9, 5, 1, −3, …

An arithmetic progression is a sequence in which subtraction of each term from the following term gives the same constant value. To test option A, calculate 5 − 9 = −4, 1 − 5 = −4, and −3 − 1 = −4. Thus every consecutive difference is −4, so option A satisfies both requirements. In option B, the differences are −5, −4, and −4, so they are not constant. Option C has a constant difference of +4, making it an AP but not one with difference −4. Option D has differences −4 and −5, so it is not an AP. Therefore option A is the only valid sequence. The negative common difference indicates that the terms decrease by 4 at every step.

Related tags

Arithmetic ProgressionCommon DifferenceSequence IdentificationIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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