The random variable is the square of the maximum minus the cube of the minimum. You roll three colored dice:
\begin{tabular}{|l|l|l|}
\hline 2 & 5 & 1 \\
\hline
\end{tabular}

Give the random variable.
\[
\text { r.v. }=
\]

Step 1 ：The random variable is defined as the square of the maximum value rolled minus the cube of the minimum value rolled.

Step 2 ：In this case, we have three dice rolls with values 2, 5, and 1.

Step 3 ：The maximum value rolled is 5 and the minimum value rolled is 1.

Step 4 ：Therefore, the random variable can be calculated as the square of 5 minus the cube of 1.

Step 5 ：Calculate the square of the maximum value: \(5^2 = 25\)

Step 6 ：Calculate the cube of the minimum value: \(1^3 = 1\)

Step 7 ：Subtract the cube of the minimum value from the square of the maximum value: \(25 - 1 = 24\)

Step 8 ：Final Answer: The random variable is \(\boxed{24}\)