Sorry for the horrible diagrams. My computer systems classjust started this seme

Question

Sorry for the horrible diagrams. My computer systems classjust started this semester and I am a little confused on how to dotruth tables for Adders and Multiplexers. I found thesesimple examples in a book and drew it out and was hopingsomeone might be able to explain it to me and how the truth tablewould work. for both of these so I can practice on the rest. **UPDATE** After alot of research I think I totally understand the topone but I am still at a loss for the multiplexer is anyone has alittle time to explain it to me. I would really appreciate it andthanks in advance.

Explanation / Answer

I dont know why the editor added the extra lines but the topNAND symbol, the third line that goes left and turns up should notbe there at all. On the second diagram, the line leading to the NOT symbolshould just be a straight line. Hope the rest is readable. Thanksin advance for the help and guidance.

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