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

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The (n)th term of an AP is (a_n=5n-2). Find the sum of the first (70) terms.

Answer and explanation

Correct answer: (12285)

The first term is (3), and the (70)th term is (348), so the sum is (12285). 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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