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Class 10 Mathematics Arithmetic Progressions (AP)Finding the sum of the first $n$ terms of an APExpert

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The (n)th term of an AP is (a_n=7n-4). Find the sum of the first (80) terms.

Answer and explanation

Correct answer: (22360)

The first term is (3), and the (80)th term is (556), so the sum is (22360). Finding the first and last terms from (a_n) is an easy method.

Related tags

Nth Term Sum Ap 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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