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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 (t_4+t_{10}=68) and (t_7+t_{17}=128). What is the sum of the first (20) terms?

Answer and explanation

Correct answer: (1100)

The two equations give (a=-2) and (d=6), so (S_{20}=1100). Exam tip: convert term sums into (a) and (d).

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Ap Term-Pair-Sum 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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