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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 (15) terms of the arithmetic progression (72,66,60,\ldots)?

Answer and explanation

Correct answer: (450)

The fifteenth term is (-12), so (S_{15}=\frac{15}{2}(72-12)=450). In a decreasing progression, keep (d) negative.

Related tags

Decreasing Ap Negative Last 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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