P $(7$ cavity $|$ toothache$)$ is $q,$ according to the following table.

$\backslash$table$[[,$toothache,$7$ toothache$],[,$catch,$7$ catch,catch,$7$ catch,$],[$cavity$,$a$,$b$,$c$,$d$,],[7$ cavity,e$,$f$,$g$,$h$,]]$

$\frac{a+b}{a+b+e+f}$

$\frac{e+f}{a+b+e+f}$

$\frac{e+f+g+h}{a+b+e+f}$

$\frac{e+f}{e+f+g+h}$n