3 input NAND gate function using only 2 input NAND gates and NO NOT gates.
Quora question from several weeks ago - designed it on the fly, 3 quick attempts on paper and finally decided to prove it after a guy went to the effort of writing a Program in 'C' to test it - you obviously can't tell from my hand sketches it works so I've done this to add screenshots. One guy tried and failed - nobody else tried. To be honest I thought it'd be harder given the first guys efforts.
Dr Mark Kennedy PhD MSc BEng.
