Capacitors connected in series

Electrical circuit contains three capacitors which are connected in series and they have different values. The subject is to designate total capacitance of capacitors connected in series. Every capacitor will have the same electrical charge Q collected on its electrodes because capacitors are connected in series. On the first electrode it will be +Q electrical charge and on the second electrode it will be -Q electrical charge. Total capacitance of circuit is marked as CX.