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The sum of the first (7) terms of an arithmetic progression is (203). If the first term is (5), what is the seventh term?

Answer and explanation

Correct answer: 53

For an AP, \(S_n=\frac{n}{2}(a+l)\), where \(l\) is the last term. Thus, \(203=\frac{7}{2}(5+l)\). So \(406=7(5+l)\), giving \(5+l=58\) and hence \(l=53\). Option 58 is the value of \(a+l\), not the seventh term. Exam tip: When the sum and the last term are involved, use \(S_n=\frac{n}{2}(a+l)\).

Related tags

Arithmetic ProgressionAp SumLast TermSequence FormulasClass 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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