1. The problem statement, all variables and given/known data Hi guys I need to implement [(B+C)*D]' in NAND only. can someone please help. 2. Relevant equations 3. The attempt at a solution this is what i have. [(B+C)*D]'=(B+C)'+D'=(B'C')+D' and i get stuck...can anyone please explain and help. any good resources to teach/practice this? I just built a table and the result [(B'C')'*D]' worked. can anyone explain the algebra behind this? I don't get what rule lets you go from B'C'+D' OR to AND since B'C' is not inverted all together (BC)' so it cant be treated as X' right?