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Class 10 Mathematics Arithmetic Progressions (AP)Finding the sum of the first $n$ terms of an APMedium

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If the sum of the first (n) terms of the AP (13,18,23,\ldots) is (253), what is (n)?

Answer and explanation

Correct answer: (11)

From (\frac{n}{2}[26+5(n-1)]=253), (n=11). Only the correct positive integer can be the number of terms.

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Find N Ap Sum Integer Answer 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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