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What is the (23)rd term of the AP \(-9,\frac{-7}{2},2,\ldots\)?

Answer and explanation

Correct answer: 112

The first term is \(a=-9\). The common difference is \(d=\frac{-7}{2}-(-9)=\frac{11}{2}\). Therefore, \(a_{23}=a+(23-1)d=-9+22\times\frac{11}{2}=-9+121=112\). Hence, the correct answer is 112. \(\frac{225}{2}\) may result from not subtracting \(-9\) correctly at the final step. Exam tip: use \(n-1\), not \(n\), in the formula for the \(n\)th term.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceFractionsClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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