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If (a_1=3) and (a_{n+1}=n a_n+2n), what is (a_4)?

Answer and explanation

Correct answer: 48

The recursive rule uses the current index n at each step. Thus, a_2=1×3+2=5, then a_3=2×5+4=14, and a_4=3×14+6=48. Therefore, the correct answer is 48. A value such as 45 may result from using an incorrect index in the final step. Exam tip: to find a_4, apply the rule successively for n=1, 2, and 3.

Related tags

Recursive SequencesRecurrence RelationSequences And ProgressionsClass 9 MathematicsIndex SubstitutionRecursive RuleMathematicsClass 9 Mcq

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