In the circuit, all elements are ideal.
For time t<0, S1 remained closed and S2 open.
At t=0, S1 is opened and S2 is closed.
If the voltage Vc2 across the capacitor C2 at t=0 is zero, the voltage across the capacitor combination at t=0+ ??
I tried this problem.
Obviously, Vc1(0) = 3V ...