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If (a_1=3) and (a_{n+1}=a_n^2-a_n), what is (a_3)?

Answer and explanation

Correct answer: 30

By the recursive rule, each new term is obtained by squaring the previous term and subtracting that same previous term. Thus, \(a_2=3^2-3=6\) and \(a_3=6^2-6=30\). Therefore, the correct answer is 30. The value 36 is only \(6^2\); the rule also requires subtracting 6. Exam tip: always find \(a_2\) before calculating \(a_3\).

Related tags

Recursive RuleNonlinear RecurrenceSequences And ProgressionsClass 9Term CalculationMathematicsClass 9 Mcq

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