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Class 10 Mathematics Arithmetic Progressions (AP)Finding the sum of the first $n$ terms of an APExpert

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In an arithmetic progression the first term is (25) and the common difference is (-2). What is the average of the first (20) terms?

Answer and explanation

Correct answer: (6)

The last term is (25+19(-2)=-13), so the average is (\frac{25-13}{2}=6). Exam tip: the average is the average of first and last terms.

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Ap Average Decreasing Expert Finding The Sum Of The First $N$ Terms Of An Ap Finding The Sum Of The First N Terms Of An Ap Arithmetic Progressions (Ap)Arithmetic Progressions Ap

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