Asked by Wayne
Use the method of differences to prove the following formulas
1) ∑_(r=1)^n▒〖r=(n(n+1))/2〗
2) ∑_(r=1)^n▒〖r^2=(n(n+1)(2n+1))/6〗
1) ∑_(r=1)^n▒〖r=(n(n+1))/2〗
2) ∑_(r=1)^n▒〖r^2=(n(n+1)(2n+1))/6〗
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