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

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If an arithmetic progression has first term (a=3), common difference (d=2), and number of terms (n=10), what is the sum of the first (10) terms?

Answer and explanation

Correct answer: (120)

Using (S_n=\frac{n}{2}[2a+(n-1)d]), we get (S_{10}=120). In exams, first identify (a), (d), and (n).

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Ap Sum N Terms Class10 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

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