8,9, and 10

8. Mr. and Mrs. Anderson plan on having three children born in different years. Construct a tree diagram and show all of the possible arrangements of boy and girl children, where B represents a boy and G represents a girl. What is the probability that Mr. and Mrs. Anderson will have: a) all girls? b) at least one boys? A jar contains two blue and ve green marbles. A marble is drawn at random and then replaced. A second marble drawn at random. For each of the following, nd the probability that: a) both marbles are blue b) both marbles are the same color c) the marbles are different in color 10. How many different four-digit numbers greater that 4000 can be formed from the digits {3, 4, 8, 9}, if: Repetition is allowed Repetition is not allowed