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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 is the sum of the first (10) terms of the arithmetic progression (75,70,65,\ldots)?

Answer and explanation

Correct answer: (525)

The tenth term is (30), so (S_{10}=\frac{10}{2}(75+30)=525). The formula for (S_n) does not change in decreasing order.

Related tags

Decreasing Ap Ap Sum Ten Terms 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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