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In an AP, (a_3+a_8+a_{13}=156). Find the value of (a_8).

Answer and explanation

Correct answer: 52

In an AP, terms with equally spaced indices have the middle term as their average. Hence, \(a_3+a_{13}=2a_8\). Therefore, \(a_3+a_8+a_{13}=3a_8=156\), giving \(a_8=52\). If \(a_8=54\), the sum would be 162, so it cannot be correct. Exam tip: For \(a_{n-r}, a_n, a_{n+r}\) in an AP, use \(a_{n-r}+a_{n+r}=2a_n\).

Related tags

Arithmetic ProgressionNth TermMiddle TermAp PropertiesClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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