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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 (17) terms of an arithmetic progression starting with (5) and having common difference (9)?

Answer and explanation

Correct answer: (1309)

The seventeenth term is (149), so (S_{17}=\frac{17}{2}(5+149)=1309). Find the last term first and use the average method.

Related tags

Ap Sum Common Difference 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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