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Which of the following rules is a recursive definition of a sequence?

Answer and explanation

Correct answer: \(a_1=2,\ a_{n+1}=a_n+4\)

Option A gives an initial term and forms every next term by adding 4 to the previous term, so it is recursive. Option B is an explicit formula. Exam tip: look for a reference to the previous term in a recursive rule.

Related tags

Recursive RuleSequencesProgressionsExplicit FormulaGrade 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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