Answer
$\frac{5}{6}$
Work Step by Step
To find a probability $P(x)$, we want to divide the number of events in the group $x$, and divide that number by the total number of events. In this case, there are $5$ numbers that are not $3$ on the spinner, and $6$ numbers in total, so P($\neg$3) is $\frac{5}{6}$.
