SOLUTION: There is a bag filled with 4 blue, 3 red and 5 green marbles. A marble is taken at random from the bag, the colour is noted and then it is replaced. Another marble is taken at

Question 1117422: There is a bag filled with 4 blue, 3 red and 5 green marbles.
A marble is taken at random from the bag, the colour is noted and then it is replaced.
Another marble is taken at random.
What is the probability of getting 2 reds?
Answer by ikleyn(52803) (Show Source): You can put this solution on YOUR website!
.

In all, there are 4 +3 + 5 = 12 marbles.


The probability to get first marble red is  .


The probability to get second marble red is the same  .


Since the outcomes of the first and the second experiments are independent,

the probability to get both 2 red marbles is the product   = .


Answer.  The probability under the question is  .

RELATED QUESTIONS
There is a bag filled with 3 blue, 4 red and 5 green marbles. A marble is taken at... (answered by jim_thompson5910)

There is a bag filled with 3 blue, 4 red and 5 green marbles. A marble is taken at... (answered by Boreal)

There is a bag filled with 3 blue, 4 red and 5 green marbles. A marble is taken at... (answered by Edwin McCravy)

There is a bag filled with 5 blue, 4 red and 3 green marbles. A marble is taken at... (answered by Boreal)

There is a bag filled with 2 blue, 4 red and 5 green marbles. A marble is taken at... (answered by mathmate)

There is a bag filled with 5 blue, 6 red and 2 green marbles. A marble is taken at... (answered by ikleyn)

There is a bag filled with 3 blue and 4 red marbles. A marble is taken at random from... (answered by ikleyn)

There is a bag filled with 5 blue and 6 red marbles. A marble is taken at random from... (answered by ikleyn)