I am an Electronics & Comm. Engg. 3rd yr. student and we are learning CMOS logic for the first time this semester under the subject VLSI design.
While designing for the logic equation: Y= A + B.C, the professor first wrote it as \overline{\overline{A+B.C}} , then simplified it by De Morgan's laws and then implemented it with CMOS.
I was wondering if it would be better to implement \overline{A+B.C} and then use a CMOS inverter to invert to output since this would need lesser number of gates. When I asked the professor if it can be done that way, he said there won't be any sense in using CMOS if used that way. I didn't understand what this means, and why it cannot be implemented this way.

P.S. I'm new on Stack Exchange. Apologies for any mistakes in my way of putting the question. P.P.S. Hence I also had trouble with using the \overline{test} function!