De Morgan's Second Theorem:
It says that complement of product equals the summation of complements.
![2416_De Morgans Second Theorem.png](https://www.expertsmind.com/CMSImages/2416_De%20Morgans%20Second%20Theorem.png)
The LHS of the equation explain a NAND (NOT-AND) gate and the RHS of the equation explain an OR gate with inverted inputs and both of the equations have the same truth table as illustrated in Figure
![604_De Morgans Second Theorem1.png](https://www.expertsmind.com/CMSImages/604_De%20Morgans%20Second%20Theorem1.png)
Figure: (a) NAND Logic Gate, (b) OR Gate with Inverted Inputs, and (c) Truth Table