$\backslash$table$[[,$toothache,not toothache$],[,$catch,not catch,catch,not catch$],[$cavity$,0\mathrm{.}108,0\mathrm{.}012,0\mathrm{.}072,0\mathrm{.}008],[not$ cavity,$0\mathrm{.}016,0\mathrm{.}064,0\mathrm{.}144,0\mathrm{.}576],[$Figure $13\mathrm{.}3,$A full joint distribution for the Toothache, Cavity, Catch world.,,$]]$

What is the prob. of $P($Toothache $/$ cavity$)?$

:

$0\mathrm{.}6$

$($:$0\mathrm{.}3,0\mathrm{.}7$:$)$