Question $3.$ Draw the circuits using logic gates of the following Expressions.

$Y\frac{?}{b}=ar(AB)\frac{+}{b}ar(B)C\frac{+}{b}ar(C)$

$Y\frac{?}{b}=ar((A+B))\frac{+}{b}ar(B)C\frac{+}{b}ar(ABC)$

Question $4.$ The Zener diode in the following circuit is rated at $4\mathrm{.}1$ V $.$ calculate the voltage drop across both the resistors.

Question $4.$ Will the LED in the following circuit glow? If yes, how much voltage will it get, if No$,$ briefly write the reason$($s$)?$