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Class 10 Mathematics Arithmetic Progressions (AP)Finding the sum of the first (n) terms of an APEasy

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What will be the sum of the first (8) terms of the arithmetic progression (100,90,80,\ldots)?

Answer and explanation

Correct answer: (520)

The first term is (100), and the eighth term is (30), so (S_8=\frac{8}{2}(130)=520). The same formula applies to decreasing progressions.

Related tags

Decreasing Ap Ap Sum First Last 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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