A recipe calls for four ingredients: flour, baking powder, shortening, and milk (F, B, S, M). But there are no directions stating the order in which they should be combined. Chris has never followed a recipe like this before and has no idea which order is best, so he chooses the order at random.
a. How many different possible orders are there?
b. What is the probability that milk should be first?
c. What is the probability that the correct order includes flour first and shortening second?
d. What is the probability that the order is FBSM?
e. What is the probability that the order isn't FBSM?
f. What is the probability that flour and milk are next to each other?