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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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If (S_n=7n^2+2n) for an arithmetic progression, what is the sum from the (9)th to the (18)th terms?

Answer and explanation

Correct answer: (1840)

The required sum is (S_{18}-S_8=2304-464=1840). Exam tip: the sum from the (m)th to (n)th term is (S_n-S_{m-1}).

Related tags

Ap Range-Sum-From-Sn 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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