Combined capacitance in series = 1CT = 1C1 + 1C2
The two capacitors have capacitance of 0.0003μF and 0.0006μF respectively
1CT = 10.0003 + 10.0006 = 0.0002+0.00010.0006
1CT = 0.00030.0006
CT = 0.0002μF.
