Addition Series: Sum of Successive Terms

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SUMMARY

The discussion focuses on deriving a formula for the sum of successive terms in an addition series, specifically the expression (8+7+...+1) + (7+6+...+1) + (6+5+...+1) + ... + 1. The established formula for the sum of the first n natural numbers, n(n+1)/2, is utilized to express the overall series as a summation of triangular numbers. The final formulation is represented as \(\frac{1}{2}\sum_{k=1}^{n}(k(k+1))\), which simplifies to \(\frac{1}{2}(\sum_{k=1}^{n}k^{2}+\sum_{k=1}^{n}k)\).

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Homework Statement


I want to have a formula of this kind,
(8+7+...+1) + (7+6+..+1) + (6+5+..+1) + ...1

Homework Equations

The Attempt at a Solution


I know , n+(n-1)+...+1 = n(n+1)/2
 
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So you want a formula for [itex]\frac{n(n+1)}{2}+\frac{(n-1)n}{2}+...[/itex], or [itex]\sum_{k=1}^{n}\frac{k(k+1)}{2}=\frac{1}{2}\sum_{k=1}^{n}(k(k+1))=\frac{1}{2}(\sum_{k=1}^{n}k^{2}+\sum_{k=1}^{n}k)[/itex].
 
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