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Which recursive rule is correct for the sequence (36, 31, 26, 21, ...)?

Answer and explanation

Correct answer: a₁ = 36, aₙ₊₁ = aₙ − 5

A recursive rule must give the starting value and describe how to obtain each term from the preceding term. Here the first term is 36, and the differences are 31−36 = −5, 26−31 = −5, and 21−26 = −5. Therefore, subtracting 5 each time gives aₙ₊₁ = aₙ − 5. Option A has the wrong first term, B increases, and D multiplies.

Related tags

Recursive-RuleDecreasing-SequenceSequencesClass-9Recursive RuleSequences And ProgressionsMathematicsClass 9 Mcq

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