How to convert NAND Gate to AND,OR and NOT Gates(Basic Gates)?

     How to convert NAND Gate to AND,OR and NOT Gates(Basic Gates)?

The below diagram is of a two input NAND gate. The first part is an AND gate and second part is a dot after it represents a NOT gate. 

We will consider the truth table of the above NAND gate i.e. a two-input gate. 

The two inputs are A and B.

Now we will see how NAND Gate is used to implement all other basic gates .

                                       

The above diagram is of an NOT,AND and OR gate made from NAND gate. So we can see that all the three basic gates can be made by only using NAND gates, that’s why this gate is called Universal Gate and it is appropriate.