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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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Find the sum of the first (21) terms of the arithmetic progression (9,16,23,\ldots).

Answer and explanation

Correct answer: (1659)

The twenty-first term is (149), so (S_{21}=\frac{21}{2}(9+149)=1659). For larger (n), write the last term first.

Related tags

Ap Sum Twenty One Terms Medium 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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