A big flower vase has 9 Lilys, 7 daisies, and 3 sunflowers. Two flowers are randomly selected without replacement. What is the probability of selecting 2 daisies? Express the answer in the simplest form of a fraction.
There are a total of 9 + 7 + 3 = 19 flowers in the vase.
The probability of selecting a daisy on the first pick is 7/19.
After selecting a daisy, there are 6 remaining daisies out of the remaining 18 total flowers.
So, the probability of selecting another daisy on the second pick is 6/18 = 1/3.
Therefore, the probability of selecting 2 daisies is: (7/19) * (1/3) = 7/57.