## Geometry: Common Core (15th Edition)

$\frac{9}{39}$
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 9 tiles that are green, and 39 in total. When we divide 9 by 39, we get $\frac{9}{39}$, which is the probability of drawing a green tile, or $P(\text{green})$.