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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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Find the sum of the AP (-25,-16,-7,\ldots,209).

Answer and explanation

Correct answer: (2484)

First (209=-25+(n-1)9) gives (n=27), and the sum is (2484). When the last term is given, find (n) first.

Related tags

Finite Ap Last Term Negative First Term 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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