An unknown capacitor C is connected in series with a 3.0F capacitor; this pair is placed in

An unknown capacitor C is connected in series with a 3.0μF capacitor; this pair is placed in parallel with a 1.0μF capacitor, and the entire combination is put in series with a 2.0μF capacitor.
(a) Make a circuit diagram of this network.
(b) When a potential difference of 100 V is applied across the open ends of the network, the total energy stored in all the capacitors is 5.8 mJ. Find C.