I3.1 If $183 a 8$ is a mu1tiple of 287 , find $a$.
I3.2 The number of positive factors of $a^{2}$ is $b$, find $b$.
I3.3 In an urn, there are $c$ balls, $b$ of them are either black or red, $(b+2)$ of them are either red or white and 12 of them are either black or white. Find $c$.

I3.4 Given $f(3+x)=f(3-x)$ for all values of $x$, and the equation $f(x)=0$ has exactly $c$ distinct roots. Find $d$, the sum of these roots.