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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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In the arithmetic progression (10,19,28,\ldots), the sum of how many first terms will be (1240)?

Answer and explanation

Correct answer: (16)

Putting (n=16) in (S_n=\frac{n}{2}[20+9(n-1)]) gives (1240). The option method is fast when finding (n).

Related tags

Find N Ap Sum Medium 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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