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If (a_1=3), (a_2=9), and (a_n=a_{n-1}+a_{n-2}+7), what is (a_5)?

Answer and explanation

Correct answer: 61

The recursive rule adds the previous two terms and 7. Thus, \(a_3=3+9+7=19\), \(a_4=9+19+7=35\), and \(a_5=19+35+7=61\). Therefore, the correct answer is 61. The option 54 is only \(19+35\), so it misses the required \(+7\). Exam tip: at every step, include both previous terms and the constant 7.

Related tags

Recursive SequencesRecurrence RelationArithmetic CalculationClass 9 MathematicsSequences And ProgressionsRecursive RuleMathematicsClass 9 Mcq

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