Experiment: Spin the spinner once and record the color where it lands, then spin it again and record where is lands. a. List the sample space for this experiment, with all the final outcomes and the probabilities for each outcome.
b. P(the first spin is blue)

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.