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

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What will be the sum of the first (18) terms of the arithmetic progression (25,22,19,\ldots)?

Answer and explanation

Correct answer: (-9)

The eighteenth term is (-26), so (S_{18}=\frac{18}{2}(25-26)=-9). The sum of a decreasing progression can also be negative.

Related tags

Decreasing Ap Negative Sum Ap Sum 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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