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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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Find the sum of the first (20) terms of the arithmetic progression (3,7,11,\ldots).

Answer and explanation

Correct answer: (820)

Here the last term is (79), and (S_{20}=\frac{20}{2}(3+79)=820). Finding the last term can often be easier.

Related tags

Ap Sum Twenty Terms 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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