There is a bag filled with 4 blue and 5 red 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?

16/81

Step-by-step explanation:

There are 9 total marbles, meaning the probability of getting a red the first time is 59.

The second time, there are only 4 red marbles and 8 total marbles, so the chance of getting a red on the second time is 12.

The probability of getting 2 reds is 59⋅12=518.

Hope this helped!

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