Notice that C 2 and C 3 are in series, and they are in parallel with C 1. That is, the
capacitor equivalent to the series combination of C 2 and C 3 (which we’ll call
C2−3) is in parallel with C 1. We can represent this as follows:
So the first step is to find C2−3.
Now this is in parallel with C 1 , so the overall equivalent capacitance (C1−2−3) is