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a bag contains 2 red, 3 yellow, and 5 green sweets. Without looking, Mary takes one out of the bag and eats i. She then takes out a second sweet. If the first was green, what is the probability that the second sweet is also green?

 Oct 4, 2016
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We have a total of 10 sweets.

 

There are 5 green, so picking a green sweet out of all in the bag has a possibility of 5/10, or 1/2.

 

Now that Mary's taken out one sweet, there are 9 total left, and 4 green ones left. This makes the probability of picking a green sweet the second time 4/9.

 Oct 5, 2016

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