\[
\text { Let } \begin{aligned}
U & =\{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20\}, \\
C & =\{1,3,5,7,9,11,13,15,17,19\} .
\end{aligned}
\]
Use the roster method to write the set $C^{\prime}$.
\[
c^{\prime}=
\]
(Use a comma to separate answers as needed. Use ascending order.)

Answer

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Answer

Final Answer: $\boxed{\{2, 4, 6, 8, 10, 12, 14, 16, 18, 20\}}$

Steps

Step 1 ：Let $U = \{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20\}$ and $C = \{1,3,5,7,9,11,13,15,17,19\}$.

Step 2 ：The set $C^\prime$ is the complement of set $C$ in $U$. This means that $C^\prime$ contains all the elements in $U$ that are not in $C$.

Step 3 ：To find $C^\prime$, we can subtract the elements of $C$ from $U$.

Step 4 ：So, $C^\prime = \{2, 4, 6, 8, 10, 12, 14, 16, 18, 20\}$.

Step 5 ：Final Answer: $\boxed{\{2, 4, 6, 8, 10, 12, 14, 16, 18, 20\}}$