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A student says that the sequence 5, 8, 11, 14, ... can be written only by an explicit formula and not by a recursive rule. Which recursive rule correctly corrects the student?

Answer and explanation

Correct answer: \(a_1=5,\ a_{n+1}=a_n+3\)

The first term is 5, and each next term is obtained by adding 3: \(5+3=8\) and \(8+3=11\). Hence A is correct. In B, terms are multiplied by 3 instead. Exam tip: generate two terms to check a recursive rule.

Related tags

Recursive RuleSequencesArithmetic ProgressionClass 9 MathematicsRecurrence RelationSequences And ProgressionsMathematicsClass 9 Mcq

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