Aweb ad can be designed from three different colors, three font types, three font sizes, three images, and five text phrases. a specific design is randomly generated by the web server when you visit the site. let a denote the event that the design color is red, and let b denote the event that the font size is not the smallest one. use the addition rules to calculate the following probabilities given that p(a) = 1/3, p(b) = 2/3, (a) p(aub) (b) p(a u b') (c) p(a' u b')