The output waveform of the given logical circuit for the following...

In the given logical circuit, all logic gates are NAND gate.

Here, the inputs $A and B$ are inverted using NOT gate (made using NAND gate), then $\overset{¯}{A}$ and $\overset{¯}{B}$ are applied as inputs in other NAND gate.

So, \left(A . A\right) = A$and B . B = B</p><p>Output at$Y$is \left(A . B\right) = A + B$.

The above boolean expression is for OR gate.

Truth table of OR gate is

The output waveform is shown below.