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Which is the (n)th term of the sequence (7,10,15,22,31,\ldots)?

Answer and explanation

Correct answer: \(n^2+6\)

Check the terms: \(7=1^2+6\), \(10=2^2+6\), \(15=3^2+6\), \(22=4^2+6\), and \(31=5^2+6\). Therefore, the \(n\)th term is \(n^2+6\). The expression \(2n+5\) is linear, so it would have a constant first difference, whereas this sequence has differences \(3,5,7,9\). Exam tip: If first differences are consecutive odd numbers, test a rule involving \(n^2\).

Related tags

SequencesNth TermQuadratic SequenceNumber PatternsClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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