[An illustration of a jar of marbles is shown. Four of the marbles
are labeled with an upper R, seven of the marbles are labeled with
an upper B, and five of the marbles are labeled with an upper G.
The key identifies upper R to represent red marbles, upper B to
represent blue marbles, and upper G to represent green
marbles.]
a. What is the probability of selecting a red marble, replacing it,
and then selecting a blue marble?...