My name is Mr William, I am a student The question is secondary
I am trying to prove a induction question
Sigam r=1 n (2r -1)cube = n square (2 n square - 1)
The expression you have
is certainly true when n = 1.
Suppose now that the expression is true for n = k - 1, then for n = k,
You should now be able to complete the problem.