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practice questions

9/10 Probability hat

There are four balls in a hat: one red, one blue, and two green. Your friend, Giuseppe, draws two balls and tells you that one of them is green. What are the chances that the other ball is also green?

Total possible options for the retrieved balls are:

G1G2, G1B, G1R, G2G1, G2B, G2R, BG1, BG2, BR, RG1, RG2, RB

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