A child has a box full of colored building blocks. She will choose one block without looking. The odds against choosing a blue block are 13/4

.What is the probability of choosing a blue block?

(b)Jenny is playing a role-playing game with her friends. She will roll dice to determine if her character unlocks a treasure chest. The probability of her character unlocking the treasure chest is 3/10

.Find the odds in favor of her character unlocking the treasure chest.