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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 (1,8,15,\ldots), the sum of how many first terms will be (504)?

Answer and explanation

Correct answer: (12)

Putting (n=12) in (S_n=\frac{n}{2}[2+7(n-1)]) gives (504). Checking options is a quick method.

Related tags

Find N Ap Sum Options 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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