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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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If in an AP (S_7=91) and (S_{21}=714), find the value of (S_{35}).

Answer and explanation

Correct answer: (1925)

The given sums give (a=4) and (d=3), so (S_{35}=1925). From two sums, first find the AP values.

Related tags

Two Sums Find Later 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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