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Class 10 Mathematics Arithmetic Progressions (AP)Finding the sum of the first (n) terms of an APMedium

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In an arithmetic progression, the sum of the first and last terms is (144), and there are (18) terms. What will be the sum of the progression?

Answer and explanation

Correct answer: (1296)

Using (S_n=\frac{n}{2}(a+l)), (S_{18}=\frac{18}{2}\times144=1296). If (a+l) is directly given, use it immediately.

Related tags

First Last Sum Ap Sum Formula 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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