A bag contains 3 red marbles, 2 blue marbles and 5 green marbles. What is the probability of selecting a blue marble, replacing it in the bag and then selecting a green marble?

Question

anonymous · Answer

7/10? @YinYangInsane

anonymous · Answer

for getting a blue marble there is 2 in 10 chance or 1/5. for selecting a green marble without the blue one gone would be 5 in 10 or 1/2. with the blur marble gone, it would be 5/9

anonymous · Answer

no direct answers plz

anonymous · Answer

its not 5/9

zarkon · Answer

multiply the probabilities 

(2/10)*(5/10)

zarkon · Answer

$$=\frac{1}{5}\times\frac{1}{2}=\frac{1}{10}$$