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Which sequence is formed by (a_n=7n^2)?

Answer and explanation

Correct answer: \(7, 28, 63, 112\)

Given \(a_n=7n^2\), substitute \(n=1,2,3,4\). This gives \(7\times1^2=7\), \(7\times2^2=28\), \(7\times3^2=63\), and \(7\times4^2=112\). Hence, the sequence is \(7, 28, 63, 112\). Option A follows \(7n\), not \(7n^2\). Exam tip: For a rule-based sequence, substitute the first few natural-number values of \(n\).

Related tags

SequencesQuadratic SequenceNth TermSequence RuleMathematics Grade 9Sequences And ProgressionsMathematicsClass 9 Mcq

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