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If \(a_1=96\) and \(a_{n+1}=\frac{a_n}{2}+n^2+n\), what is \(a_3\)?

Answer and explanation

Correct answer: 31

Apply the recursive rule first with \(n=1\): \(a_2=\frac{96}{2}+1^2+1=48+2=50\). Next, use \(n=2\): \(a_3=\frac{50}{2}+2^2+2=25+6=31\). Hence, 31 is correct. Option 30 may result from adding \(2^2+2\) incorrectly in the second step. Exam tip: To find \(a_3\), apply the rule successively for \(n=1\) and \(n=2\).

Related tags

Recursive SequencesRecursive RuleSequences And ProgressionsClass 9 MathematicsSequence TermsMathematicsClass 9 Mcq

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