The sum of the first n terms of the series 1 + 2.2^2 + 3^2 + 2.4^2 + 5^2 + 2.6^2 + ...... is n(n+1)^2/2 when n is even. When n is odd the sum is:
Sum of N terms of an AP - Formula, Examples | Sum of AP Formula
Sum Of The First n Terms Of An Arithmetic Progression - A Plus Topper
Example 12 - Find sum of first n terms and of first 5 terms
Sum of n terms in arithmetic series
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Doubt in finding the general term and sum of $n$ terms of the series $1+5+19+49+101+181+295+\dots+T_n$? - Mathematics Stack Exchange
Sum of n terms of an Arithmetic Progression
The sum of the first n terms of an arithmetic progression is n^2 + 3n. How to show that the terms of the series are in arithmetic progression? - Quora
The Sum of the First n Terms of an Arithmetic Sequence - Video & Lesson Transcript | Study.com
Sum of N terms of an AP - Formula, Examples | Sum of AP Formula
Sum of n Terms of Series
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Sum to n terms of Special Series - Study Material for IIT JEE | askIITians
Formulas--Sum of an Arithmetic Series of N Terms | Media4Math
The Sum of the First n Terms of an Arithmetic Sequence - Video & Lesson Transcript | Study.com
Sum of 'n' terms of an A.P – GeoGebra
sum of n terms in ap formula Archives | MIT
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If the sum of first m terms of an A.P. is the same as the sum of its first n terms - Edusaint Q&A
Example 20 - Find sum to n terms of series, nth term is n(n + 3)
Sum Of The First n Terms Of An Arithmetic Progression - A Plus Topper
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Find the nth term from given sum of n term in a series is S_n=n(2n+3) - YouTube
