Roland works as a plumber and has a small set of extra labels for faucets in a small bag. The labels are H for "hot" and C for "cold". His colleague texts him to ask for two "hot" labels. Herandomly pulls two labels from the bag.The tree diagram below shows the probabilities of the different outcomes.

Tree diagram with outcomes.

https://d35entzeu9cx6y.cloudfront.net/services/cms/media/original_images/20200209-51052e07-a3e3-43a7-94a3-5c2a8af4c1ec.jpg?0

Based on the diagram, what is the probability of pulling two "hot" labels?

• Provide the final answer as a fraction.