What is the equivalent capacitance between points $A$ and $B$?

When a series combination of $2.0\ \mu F$ and $8.0\ \mu F$ capacitors is connected to a $300\ V$ potential difference,the charge on the $2.0\ \mu F$ capacitor is .....

Find the equivalent capacitance between points $A$ and $B$ in the given figure. (in $\mu F$)

Find the equivalent capacitance between point $A$ and $B$. (in $C$)

Two condensers of capacities $C$ and $2C$ are connected in parallel and then in series with a $3^{\text{rd}}$ condenser of capacity $3C$. The combination is charged to $V$ volts. The charge on the condenser of capacity $C$ is:

In the given circuit,each capacitor has a capacitance of $3\,\mu F$. What is the equivalent capacitance between points $A$ and $B$ in $\mu F$?