SOLUTION: An urn contains 10 red marbles and 30 green marbles. A marble is drawn at random, but not replaced. Then another marble is drawn. Find the probability of these events. 1.Both m

Algebra ->  Probability-and-statistics -> SOLUTION: An urn contains 10 red marbles and 30 green marbles. A marble is drawn at random, but not replaced. Then another marble is drawn. Find the probability of these events. 1.Both m      Log On


   

Question 865845: An urn contains 10 red marbles and 30 green marbles. A marble is drawn at random, but not replaced. Then another marble is drawn. Find the probability of these events.
1.Both marbles drawn are red
2.Both marbles drawn are green
3.The first marble drawn is red and the second marble drawn is green
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1. P%28R1%29=10%2F40=1%2F4
P%28R2%29=9%2F39=3%2F13
P%28R1%2CR2%29=%281%2F4%29%283%2F13%29=3%2F52
.
.
2. P%28G1%29=30%2F40=3%2F4
P%28G2%29=29%2F39
P%28G1%2CG2%29=%283%2F4%29%2829%2F39%29=29%2F52
.
.
3. P%28R%29=10%2F40=1%2F4
P%28G%29=30%2F39=10%2F13
P%28R%2CG%29=%281%2F4%29%2810%2F13%29=10%2F52=5%2F26