## Geometry: Common Core (15th Edition)

$\frac{7}{11}$
To calculate probability, we need to divide the number of chances for a certain outcome to occur by the total number of outcomes. In this case, there are $4$ tiles with the letter "S" and $11$ tiles in total. This means that the other $11-4=7$ tiles must be "not S." When we divide $7$ by $11$, we get $\frac{7}{11}$, which is the probability of drawing a letter that is not "S," or $P(\text{Not S})$.