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If (a_1=2) and (a_{n+1}=7a_n-4), what is (a_3)?

Answer and explanation

Correct answer: 66

In a recursive rule, each new term is found from the preceding term. First, \(a_2=7\times2-4=10\). Then, \(a_3=7\times10-4=66\). Therefore, the correct answer is 66. A value such as 62 can result from an incorrect multiplication or subtraction in the final step. Exam tip: always write \(a_2\) before finding \(a_3\).

Related tags

Recursive SequencesRecurrence RelationArithmetic OperationsClass 9 MathematicsSequences And ProgressionsRecursive RuleMathematicsClass 9 Mcq

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