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Which formula for the \(n\)th term represents an arithmetic progression with first term 3 and common difference 4?

Answer and explanation

Correct answer: \(a_n=4n-1\)

For an AP, \(a_n=a+(n-1)d\). With \(a=3\) and \(d=4\), \(a_n=3+4(n-1)=4n-1\). Option C gives first term 7, not 3. Exam tip: put \(n=1\) to check the first term.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceSequencesClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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