# A bag contains one marble which is either green or blue, with equal probabilities. A

**Chapter 2, Problem 22**

(choose chapter or problem)

A bag contains one marble which is either green or blue, with equal probabilities. A green marble is put in the bag (so there are 2 marbles now), and then a random marble is taken out. The marble taken out is green. What is the probability that the remaining marble is also green?

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