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In the sequence (9,18,27,36,\ldots), which term is (81)?

Answer and explanation

Correct answer: ninth term

This sequence consists of multiples of 9, so its nth term is \(a_n=9n\). Putting \(9n=81\) gives \(n=9\). Therefore, 81 is the ninth term. The eighth term is \(9\times8=72\), so it is not correct. Exam tip: To find a term number, equate the given value to the nth-term formula and solve for \(n\).

Related tags

SequencesArithmetic ProgressionNth TermClass 9 MathematicsMultiplesSequences And ProgressionsMathematicsClass 9 Mcq

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