a) If a hotel has 26 king size beds, 22 queen sized beds, 28 double beds, and 37 twin beds, what is the probability that you will be given a queen size or twin bed when you register, if the beds are chosen randomly?
b) If a sample of 1 can be drawn from an automatic storage and retrieval rack with 3 different storage racks and 4 different trays in each rack, what is the number of different ways of obtaining a tray?