A delivery truck must make a stop in one of eight different cities, designated by the first letter in the name of the city: A, B, C, D, E, F, G, and H. How many arrangements are there for the truck to visit all of the cities? __________

a.8!b.116c. 2880d.answer not listed

A jar contains twelve marbles: five are blue, 3 are yellow and 4 are red.If two marbles are chosen at random and without replacement, what is the probability of selecting blue then red? _______