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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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If in an AP (S_{15}=600) and the (15)th term is (68), find (S_{30}).

Answer and explanation

Correct answer: (2100)

From (S_{15}=\frac{15}{2}(a+68)), (a=12), then (d=4) and (S_{30}=2100). Treat the given (n)th term as the last term.

Related tags

Given Term And Sum Find Sn 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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