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Which of the following is a second-order recursive rule that requires two initial terms to determine a sequence uniquely?

Answer and explanation

Correct answer: \(a_n=3a_{n-1}-a_{n-2}\)

Option B uses both \(a_{n-1}\) and \(a_{n-2}\), so two starting values, \(a_1\) and \(a_2\), are needed. A and D are first-order rules. Exam tip: check the farthest previous subscript used.

Related tags

Recursive SequencesSecond Order RecurrenceInitial TermsSequences And ProgressionsClass 9 MathematicsRecursive RuleMathematicsClass 9 Mcq

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