A few probability questions. Quickly please :) I have tried to do them but seem to be unable to figure these 2 out.
1). There are 2 red and 5 green balls in the bag. Shirley randomly chooses balls one at a time, with replacement. What is the probability of choosing 2 green balls and one red ball?
A 50/343
B 5/21
C 2/21
D 20/147
2). A bag contains 6 red marbles, 4 blue marbles, 7 green marbles, and 3 yellow marbles. A marble is drawn from the bag and not replaced. Then a second marble is drawn. What is the probability that both marbles were red?
A 3/40
B 9/100
C 3/38
D 9/95