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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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The (8)th term of an arithmetic progression is (31) and the (20)th term is (79). What is the sum of the first (20) terms?

Answer and explanation

Correct answer: (980)

From the two terms (d=4) and (a=3). Hence (S_{20}=980); exam tip: find (a) and (d) before applying the sum formula.

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Ap Term-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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