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What is the sum of the first (14) terms of the AP (4,10,16,\ldots)?

Answer and explanation

Correct answer: 602

Here, the first term is \(a=4\), the common difference is \(d=10-4=6\), and \(n=14\). Using \(S_n=\frac{n}{2}[2a+(n-1)d]\), we get \(S_{14}=\frac{14}{2}[2(4)+13(6)]=7(86)=602\). Therefore, 602 is correct. Although 604 is close, it does not result from correct substitution in the formula. Exam tip: identify \(a\), \(d\), and \(n\) before applying the sum formula.

Related tags

Arithmetic ProgressionAp SumFirst N TermsCommon DifferenceClass 10 MathematicsFinding The Sum Of The First $N$ Terms Of An ApFinding The Sum Of The First N Terms Of An ApArithmetic Progressions (Ap)

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