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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 (11,18,25,\ldots) have sum (1701)?

Answer and explanation

Correct answer: (21)

Solving (\frac{n}{2}[22+7(n-1)]=1701) gives (n=21). The number of terms must 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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