Which one of the following Boolean expressions is NOT correct?
A. $$\overline {{\text{x}} + {\text{y}}} = \overline {\text{x}} \overline {\text{y}} $$
B. $$\overline {\overline {\overline {\text{x}} } + {\text{y}}} = \overline {\text{x}} \overline {\text{y}} $$
C. $$\overline {\overline {\overline {\text{x}} } + \overline {\overline {\text{y}} } } = \overline {\text{x}} + \overline {\text{y}} $$
D. $$\overline {\overline {\text{x}} + \overline {\text{y}} } = {\text{xy}}$$
Answer: Option C
This Question Belongs to Electronics And Communications Engineering >> Digital Electronics
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