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If (a_1=2) and (a_{n+1}=3a_n), what is (a_3)?

Answer and explanation

Correct answer: 18

Each new term is 3 times the preceding term. Thus, \(a_2=3\times2=6\) and \(a_3=3\times6=18\). Therefore, the correct answer is 18. Option 6 is the second term, not the third. Exam tip: evaluate recursive sequences one term at a time.

Related tags

Recursive SequencesRecursive RuleSequences And ProgressionsClass 9Geometric ProgressionMathematicsClass 9 Mcq

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