A tautology is a Boolean formula that is always true. Which of the following is a tautology?
Step-by-step Solution:
\( x + \overline{y} + \overline{x} \)
= \( x +\overline{x} + \overline{y} \)
= \( 1 + \overline{y} \)
= 1
So, it is always true