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

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In an AP, (S_{10}=250) and (S_{20}=900). Find the value of (S_{30}).

Answer and explanation

Correct answer: (1950)

The two sums give (a=7) and (d=4), so (S_{30}=1950). When two partial sums are given, find (a,d) first.

Related tags

Two Sums Find Sn 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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