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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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Find the sum of the first (18) terms of the arithmetic progression (-20,-14,-8,\ldots).

Answer and explanation

Correct answer: (558)

The eighteenth term is (82), so (S_{18}=\frac{18}{2}(-20+82)=558). Keep the sign of the negative first term in mind.

Related tags

Negative First Term 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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