In the figure the battery has potential difference $V=10\mathrm{.}5V,C_2=3\mathrm{.}50F,C_4=4\mathrm{.}40F,$ and all the capacitors are initially uncharged. When switch Sis closed, a total charge of $13\mathrm{.}0C$ passes through point a and a total charge of $6\mathrm{.}00C$ passes through point $b.$ What are $($a$)C_1$ and $($b$)C_3?$

$($a$)$ Number

Unit

$($b$)$ Number

i

Unit