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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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In an arithmetic progression (a=6) and (d=7). If (S_n=760), what is (n)?

Answer and explanation

Correct answer: (16)

Solving (\frac{n}{2}[12+7(n-1)]=760) gives (n=16). Exam tip: accept only the positive integer root.

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Ap Quadratic-Sum 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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