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If (a_1=6) and (a_{n+1}=a_n+n(n+4)+2), what is (a_3)?

Answer and explanation

Correct answer: 27

Use the recursive rule successively to find the next terms. For \(n=1\), \(a_2=6+1(1+4)+2=13\). Then, for \(n=2\), \(a_3=13+2(2+4)+2=13+12+2=27\). Therefore, the correct answer is \(27\). The nearby distractor \(25\) can result from incorrectly evaluating \(2(2+4)\) in the second step. Exam tip: substitute the next integer value of \(n\) each time you calculate a new term.

Related tags

Recursive SequencesRecursive RuleSequences And ProgressionsClass 9 MathematicsTerm CalculationMathematicsClass 9 Mcq

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