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If \(k_1=64\) and \(k_n=\frac{k_{n-1}}{2}+n\), what is the value of \(k_4\)?

Answer and explanation

Correct answer: 14

In a recursive rule, each new term is calculated from the preceding term. \(k_2=\frac{64}{2}+2=34\), \(k_3=\frac{34}{2}+3=20\), and \(k_4=\frac{20}{2}+4=14\). Hence, the correct answer is \(14\). A choice such as \(12\) can result from missing the division by 2 before adding 4. Exam tip: at every step, first divide the previous term by 2 and then add the current index \(n\).

Related tags

SequencesProgressionsRecursive RuleRecurrence RelationClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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