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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 (S_{10}=310) and (S_{20}=1120). What is the sum from the (11)th term to the (20)th term?

Answer and explanation

Correct answer: (810)

The required sum is (S_{20}-S_{10}=1120-310=810). Exam tip: use the difference of cumulative sums for middle terms.

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Ap Partial-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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