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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 the arithmetic progression (80,76,72,\ldots), what is the sum from the (5)th term to the (20)th term?

Answer and explanation

Correct answer: (544)

(t_5=64) and (t_{20}=4), so the sum is (\frac{16}{2}(64+4)=544). Exam tip: count the selected terms correctly.

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Ap Selected-Terms-Sum 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 Mathematics

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