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Which recursive rule is correct for the sequence 6, 9, 14, 21, …?

Answer and explanation

Correct answer: a₁ = 6, aₙ₊₁ = aₙ + 2n + 1

A recursive rule must specify the correct starting term and reproduce every successive term from the previous one. The sequence begins with 6, and its successive differences are 9−6 = 3, 14−9 = 5, and 21−14 = 7. In the rule aₙ₊₁ = aₙ + 2n + 1, the added amounts are 3 for n = 1, 5 for n = 2, and 7 for n = 3. Starting from a₁ = 6, it therefore produces 9, 14, and 21 exactly. Thus option B is correct. Option A adds 2, 4, and 6, so it produces a different sequence. Option C has the wrong first term, while option D produces 6, 9, 15, 27. Checking both the initial value and the transition confirms the answer.

Related tags

Recursive-RuleSequence-PatternSuccessive-DifferencesGrade-9Recursive RuleSequences And ProgressionsMathematicsClass 9 Mcq

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