probability...

[naisha_grace]

A bag of marbles contains only the colors yellow, green and blue.


a) THe probability of getting a yellow marble is 2/3. What is the probability of getting a blue or green?


b) The probability of getting a green marble is 1/4. What is the probability of getting a blue marble?


c) There are 24 marbles in the bag. HOw many are blue?

 

[Gene]

a) Since the p + not-p = 1 and (green or blue) = not yellow then
y +(g or b) = 1
2/3 + (b+g) = 1
b+g = 1/3

b) g = 1/4, y = 2/3
b+g+y=1
b = ?

c) b*24 = ?