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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_{12}=294) and (S_{24}=1020). What is (S_{36})?

Answer and explanation

Correct answer: (2178)

These give (a=8) and (d=3), so (S_{36}=2178). Exam tip: you may write (S_n) as a quadratic in (n).

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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