Hello, mehn!

Please check the wording of the problem.

None of it makes sense.

It is known that the generating function for the sequence , {1, 8, 27, 64, ...}

. . is: .[x(x^2 + 4x +1)]/(1-x)^4 . What?

Use the result to show summation from r = 1 to n of r^3

. .is: .[n^2(n^2+1)]/4 . Not true

The generating function is: .f(r) = r^3

. . The terms are consecutivecubes.

The sum of the firstncubes is: .[n^2(n+1)^2]/4