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In an AP, if the 7th and 13th terms are known, which of the following relations is always true for the 10th term?

Answer and explanation

Correct answer: \(a_{10}=\frac{a_7+a_{13}}{2}\)

The indices 7, 10 and 13 are equally spaced by 3, so their AP terms are also equally spaced. Therefore, the middle term is the average: \(a_{10}=\frac{a_7+a_{13}}{2}\). Exam tip: look for equally spaced term numbers.

Related tags

Arithmetic ProgressionNth TermAp PropertiesTerm IndicesMathematics Class 10Finding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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