$($c$26$p$80\_6$e$)$ Three capacitors are connected in parallel. Each has plate area A $=1\mathrm{.}0010-2$ m$2$ and plate spacing d $=1\mathrm{.}5010-3$ m$.$ What must be the spacing of a single capacitor of plate area A if its capacitance equals that of the parallel combination?

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What must be the spacing if the three capacitors are connected in series?