Posted by Chris on Tuesday, January 29, 2013 at 10:54pm.
Can somebody help me solve this problem ? I am not so good with probability. 
A bag contains 2 green marbles and 3 white marbles. One marble is drawn at random and not replaced.
Then a second marble is drawn. What is the probability that the first marble is white and the second one
is green?

Math  Reiny, Tuesday, January 29, 2013 at 10:58pm
Prob(white, then green)
= (3/5)(2/4) = 3/10
Can you tell where my numbers came from ?

Math  Chris, Tuesday, January 29, 2013 at 11:01pm
3/5 came from the probability of drawing White marbles. I am not sure about the (2/4)

Math  Reiny, Tuesday, January 29, 2013 at 11:22pm
since you kept the first marble drawn, there are now only 4 left, but the 2 greens are still in there
so 2/4 for the greens

Math  Chris, Tuesday, January 29, 2013 at 11:23pm
Okay , that makes sense .
Answer This Question
Related Questions
 Math  A bag contains 2 white marbles and 7 purple marbles. Two marbles are ...
 College math  A bag contains 9 white 7yellow marbles,8 green marbles. If one ...
 Math HELP! Ms.Sue  A bag contains 2 white marbles and 7 purple marbles. Two ...
 HELP!! MATH!  A bag contains 2 white marbles and 7 purple marbles. Two marbles ...
 Marbles  A bag contains 10 green marbles, 9 white marbles, 7 red marbles. If ...
 Math  A bag contains 4 green marbles, 6 red marbles, and 2 white marbles. Three...
 math  A bag contains 8 green marbles,5 blue marbles, and 4 white marbles,If one...
 Math :(  A bag contains 2 white marbles and 7 purple marbles. Two marbles are ...
 elem math core  A bag contains one each of red, blue, green, yellow and white ...
 Algebra 2  a bag contains 3 red marbles and 6 green marbles a marble is drawn ...
More Related Questions