24. Evaluate the determinant of A where $x_i = i$ and $k = 4$.

$$

A =

\begin{bmatrix}

1 & 1 & 1 & ... & 1 \\

x_1 & x_2 & x_3 & ... & x_k \\

x_1^2 & x_2^2 & x_3^2 & ... & x_k^2 \\

. & . & . & ... & . \\

x_1^{k-1} & x_2^{k-1} & x_3^{k-1} & ... & x_k^{k-1}

\end{bmatrix}

$$