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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 (7) terms of the arithmetic progression (60,55,50,\ldots)?

Answer and explanation

Correct answer: (315)

The seventh term is (30), so (S_7=\frac{7}{2}(60+30)=315). The same sum formula works for a decreasing progression.

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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