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(1+2+3+.......+(n-1))^2 + n^3

= (n(n-1)/2)^2 + n^3

= (n^4 -2n^3 +n^2)/4 + n^3

= (n^4 +2n^3 +n^2)/4

=n^2*(n+1)^2/4

= (n(n+1)/2)^2

= (1+2+3+.......+n)^2

yes it is true