What are the advantage of digital circuits?

Draw the output signals $C_1$ and $C_2$ in the given combination of gates.

The Binary Code equivalent of decimal 429 is

The time variations of signals are given in $A, B$ and $C$. Point out the true statement from the following.

The time variations of signals are given as in $A, B$ and $C$. Point out the true statement from the following.