Answer:

Step-by-step explanation:
We have been given that Maria has three red dresses, 2 white dresses, and one blue dress. We are asked to find the probability that Maria will wear a blue dress at her party.

We know that number of blue dresses is 1, so number of favorable outcomes is 1.
Total dresses = 3 Red dresses + 2 White dresses + 1 Blue dress = 6 dresses.

Therefore, our required probability is
.