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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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How many first terms of the arithmetic progression (16,23,30,\ldots) have sum (1085)?

Answer and explanation

Correct answer: (14)

Substituting (n=14) in (S_n=\frac{n}{2}[32+7(n-1)]) gives (1085). Exam tip: options can be checked quickly too.

Related tags

Ap Find-Number-Of-Terms 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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