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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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How many first terms of the AP (7,12,17,\ldots) have sum (1090)?

Answer and explanation

Correct answer: (20)

Solving (\frac{n}{2}[14+5(n-1)]=1090) gives (n=20). The number of terms must always be a positive integer.

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Find N Ap Sum Equation 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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