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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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Find the sum of the AP (-6,1,8,\ldots,169).

Answer and explanation

Correct answer: (2119)

First, (169=-6+(n-1)7) gives (n=26), and the sum is (2119). When the last term is given, find (n) first.

Related tags

Finite Ap Last Term Sum 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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