Which of the following is equivalent to the expression<span class="math-tex">\(\left( {\overline {\overline {X + Y} + \bar Z} } \right)\)</span>?
Apply De Morgan's law to the outer bar: \(\overline{\overline{X+Y} + \bar{Z}} = \overline{\overline{X+Y}} \cdot \overline{\bar{Z}} = (X + Y) \cdot Z\)
Answer: (D) (X + Y)Z
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