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If (a_1=6) and (a_{n+1}=a_n+(2n-1)), what is (a_5)?

Answer and explanation

Correct answer: 22

The recursive rule adds consecutive odd numbers. Thus, \(a_2=6+1=7\), \(a_3=7+3=10\), \(a_4=10+5=15\), and \(a_5=15+7=22\). Hence, 22 is correct. The value 20 would result only if an increment were missed, so it is not correct. Exam tip: to find \(a_{n+1}\), use the value of \(n\) corresponding to the current term number.

Related tags

Recursive SequencesRecursive RuleOdd Number IncrementsSequences And ProgressionsClass 9 MathematicsMathematicsClass 9 Mcq

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