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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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If the (n)th term of an arithmetic progression is (a_n=5n+4), find the sum of the first (20) terms.

Answer and explanation

Correct answer: (1130)

The first term is (9) and the twentieth term is (104), so (S_{20}=\frac{20}{2}(9+104)=1130). Use (a_n) to find the first and last terms.

Related tags

Nth Term Ap Sum Sequence 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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