Write the Reduced Expression for the Following Karnaugh Map

Short Answer

Write the reduced expression for the following Karnaugh map. $$\begin{array} { c | c | c | c | c } & A B & A B ^ { \prime } & A ^ { \prime } B ^ { \prime } & A ^ { \prime } B \\\hline C D & & & & \\\hline C D ^ { \prime } & 1 & 1 & 1 & 1 \\\hline C ^ { \prime } D ^ { \prime } & & & 1 & 1 \\\hline C ^ { \prime } D & & & &\end{array}$$