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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 AP, (S_{10}=310) and (S_{20}=920). Find the sum from the (21)st term to the (30)th term.

Answer and explanation

Correct answer: (910)

The given sums determine the AP, and (S_{30}-S_{20}=910). Before finding a later block sum, determine (a,d).

Related tags

Two Sums Range Sum Ap 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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