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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 the arithmetic progression (14,20,26,\ldots), what is the sum from the (5)th term to the (20)th term?

Answer and explanation

Correct answer: (1328)

This is the sum of (16) terms with (t_5=38) and (t_{20}=128). Exam tip: treat the required middle part as a smaller AP.

Related tags

Ap Partial-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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