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What is the common difference in the arithmetic progression (11,8,5,2,\ldots)?

Answer and explanation

Correct answer: (-3)

The common difference of an arithmetic progression is the fixed amount obtained when one term is subtracted from the next term. It may be positive when the terms increase, negative when they decrease, or zero when they remain constant. Here the sequence moves downward from 11 to 8, then to 5 and 2, so the difference should be negative.

Using consecutive terms, subtract the first term from the second: \(8-11=-3\). Checking the next pairs gives \(5-8=-3\) and \(2-5=-3\), confirming that the difference is constant. Therefore the correct choice is B, \(-3\). Choice A, 3, gives the size of the decrease but not its signed common difference.

Related tags

SequencesProgressionsArithmetic-ProgressionClass-9Easy

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