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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 (9) terms of the arithmetic progression (16,19,22,\ldots)?

Answer and explanation

Correct answer: (252)

The ninth term is (40), so (S_9=\frac{9}{2}(16+40)=252). The average of the first and last terms is the middle term.

Related tags

Ap Sum Nine Terms 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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