12. There are 7 blue and 23 red balls in a box. Lisa is playing a game, where she has to grab a ball from a box. If she grabs a blue ball- she wins 20S, if she grabs red- loses 5$. Lisa grabs two balls, one by one, (balls are not returned after they are grabbed) a. Describe events that will mark whole sample space. b. Draw a fully labelled probability tree, representing all possible outcomes. c. What is the probability that Lisa will have blue ball in her second draw? d. Consider a scenario, where second ball Lisa grabbed was red. What is the probability that first ball was also red?