a
$A=\left[\begin{array}{lll}{1} & {a} & {a^{2}} \\ {1} & {b} & {b^{2}} \\ {1} & {c} & {c^{2}}\end{array}\right]\left[\begin{array}{lll}{1} & {1} & {1} \\ {a} & {b} & {c} \\ {a^{2}} & {b^{2}} & {c^{2}}\end{array}\right]$
$\Rightarrow \quad \operatorname{det}(\mathrm{A})=(\mathrm{a}-\mathrm{b})^{2}(\mathrm{b}-\mathrm{c})^{2}(\mathrm{c}-\mathrm{a})^{2}$
and det $(4 \mathrm{I})=64$
$\Rightarrow \quad(a-b)(b-c)(c-a)=\pm 8$
$\because \quad(a-b)+(b-c)+(c-a)=0$
$\therefore \quad(a-b)^{3}+(b-c)^{3}+(c-a)^{3}$
$=3(a-b)(b-c)(c-a)=\pm 24$