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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_{10}=0) and (S_{20}=600). What is the first term?

Answer and explanation

Correct answer: ( -27 )

From (S_{10}=0), (2a+9d=0), and from (S_{20}=600), (d=6), so (a=-27). Exam tip: use the zero sum to form a relation.

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Ap Zero-Sum-Relation 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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