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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 first term of an AP is (6), and its (9)th term is (2) times its (4)th term. What is the sum of the first (25) terms?

Answer and explanation

Correct answer: (1050)

The condition gives (6+8d=2(6+3d)), so (d=3) and (S_{25}=1050). Convert the term condition into an equation first.

Related tags

Term Condition Ap Sum Hard 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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