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Which is the general term of the arithmetic progression (9,13,17,21,\ldots)?

Answer and explanation

Correct answer: \(a_n=4n+5\)

Here, the first term is \(a=9\) and the common difference is \(d=13-9=4\). Thus, \(a_n=a+(n-1)d=9+4(n-1)=4n+5\). Therefore, option B is correct. In option C, putting \(n=1\) gives the first term as \(-1\), not 9. Exam tip: identify the first term and common difference, then apply \(a_n=a+(n-1)d\) directly.

Related tags

Arithmetic ProgressionGeneral TermNth TermSequences And ProgressionsClass 9 MathematicsMathematicsClass 9 Mcq

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