Capacitance

In the given problem, Ceq = C1C2C3C4/(C1 + C2 + C3 + C4)

The answer says the equivalent capacitance is always less than C1 but I can’t come up with thy. When I do this, I can’t seem to prove that equivalent capacitance is always less than C1. For example, if I let:

C1 = 998 F, C2 = 999 F, C3 = 1000 F and C4 = 10001 F, then I get an answer (767119326 F) and this is much larger than C1. Any suggestions?

(I realize the capacitances used here are very large, but they are just used to make a point.)

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