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What is the (n)th term of the sequence (3,8,15,24,\ldots)?

Answer and explanation

Correct answer: \(n^2+2n\)

The successive differences are 5, 7, and 9, which are consecutive odd numbers, so the pattern is quadratic. Substituting \(n=1,2,3,4\) into \(n^2+2n\) gives 3, 8, 15, and 24 respectively. Therefore, option A is correct. Option B gives 6 when \(n=2\), not 8. Exam tip: verify an nth-term formula by checking it against the first few terms.

Related tags

SequencesProgressionsNth TermQuadratic SequenceNumber PatternsSequences And ProgressionsMathematicsClass 9 Mcq

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