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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 (6) terms of the arithmetic progression (20,18,16,\ldots)?

Answer and explanation

Correct answer: (90)

The first (6) terms go from (20) to (10), and the average is (15), so the sum is (90). The average of equally spaced terms is useful.

Related tags

Decreasing Ap Sum Average 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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