There are 7 red cups and 5 blue cups on a shelf. If 4 cups are selected at random from the shelf, what is the probability that all 4 cups selected are blue cups?	Choose one.
A) 1/80  B) 1/88  C) 1/90  D) 1/95  E) 1/99
The number of ways of choosing 4 cups from the shelf is 12C4 = 495.   The number of ways of choosing 4 blue cups is 5C4 = 5.   P(4 blue cups) = 5/495=1/99.   The answer is 1/99.
<result>E</result>
There are 7 red cups and 5 blue cups on a shelf. If 4 cups are selected at random from the shelf, what is the probability that all 4 cups selected are blue cups?