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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 is the sum of the first (23) terms of the arithmetic progression (16,20,24,\ldots)?

Answer and explanation

Correct answer: (1380)

The twenty-third term is (104), so (S_{23}=\frac{23}{2}(16+104)=1380). With an odd number of terms, the middle term can also check the sum.

Related tags

Ap Sum Odd Number 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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