What is the equivalent capacitance of the system of capacitors between $A$ $\&$ $B$
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The capacitors in the right hand square are in series. So they can be replaced by an equivalent capacitor of capacitance of$:$
$1 /(1 / C+1 / C)=C / 2$
The next step is to replace $\mathrm{C}$ and $\mathrm{C} / 2$ by a capacitor having an equivalent capacitance of $\mathrm{C}$ and $\mathrm{C} / 2$ in parallel.
$C+C / 2=3 C / 2$
Then, $\mathrm{C}$ and $3 \mathrm{C} / 2$ are in series. So, they can be replaced by a capacitor having an equivalent capacitance of
$1 /(1 / C+2 / 3 C)=3 C / 5$
Then since in parallel they can be replaced by an equivalent capacitance of $C+$
$3 C / 5=8 C / 5=1.6 C$
So the equivalent capacitance is $1.6 \mathrm{C}$
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