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4 May, 18:02

There are 5 blue marbles and 4 red marbles in a bag. One marble is drawn from the bag and placed back into the bag. Then, a second marble is drawn. What is the probability that the two randomly selected marbles are both red.

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  1. 4 May, 20:38
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    There are 9 total marbles and 4 red marbles, since we replace after choosing the probability of choosing two reds in a row are:

    (4/9) ^2=16/81 (about 19.75%)
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