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In a sequence, (c_1=1), (c_2=3), and (c_n=2c_{n-1}+c_{n-2}). What is the value of (c_5)?

Answer and explanation

Correct answer: 41

By the recursive rule, each new term equals twice the preceding term plus the term before it. Thus, \(c_3=2(3)+1=7\), \(c_4=2(7)+3=17\), and \(c_5=2(17)+7=41\). Therefore, the correct answer is 41. A close distractor such as 39 can result from using an incorrect previous term. Exam tip: write the two preceding terms at every step before calculating the next one.

Related tags

SequencesRecursive SequencesRecurrence RelationArithmeticClass 9ProgressionsRecursive RuleSequences And Progressions

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