26. Capacitors & Dielectrics

Which of the following statements correctly describes the equivalent capacitance $C_{\mathrm{eq}}$ of a circuit where two capacitors $C_1$ and $C_2$ are connected in series, and this combination is connected in parallel with a third capacitor $C_3$?

What is the equivalent capacitance of the following capacitors?

For the system of capacitors shown in Fig. E$24.16$, find the equivalent capacitance between $b$ and $c$.