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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 (14)th term of an AP is (52), and the (31)st term is (120). Find the sum of the first (40) terms.

Answer and explanation

Correct answer: (3120)

The two terms give (d=4) and (a=0), so (S_{40}=3120). Finding the common difference from distant terms is the first step.

Related tags

Two Terms Find 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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