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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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In an arithmetic progression (S_9=189) and (S_{18}=702). What is (S_{27})?

Answer and explanation

Correct answer: (1539)

These sums give (a=5) and (d=4), so (S_{27}=1539). Exam tip: write (S_n) in terms of (a) and (d).

Related tags

Ap Given-Two-Sums Expert 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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