The summation of number series

Nfut Nfut · 2023-10-29T23:06:58.063Z

Explain how to verify that r(r+1)(r+2)-(r-1)r(r+1)=3r(r+1) ans used your result to find the thé sum of the séries in the sum r=1 to n r(r+1)

The summation of number series | Kawlo