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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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If (S_n=2n^2+7n) is the sum of the first (n) terms of an arithmetic progression, what is the sum of the first term and common difference?

Answer and explanation

Correct answer: (13)

(a_1=S_1=9) and (a_2=S_2-S_1=13), so (d=4) and (a+d=13). Exam tip: start with (S_1) and (S_2-S_1).

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Ap Sum-Polynomial 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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