Probability Basicshard
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A box contains 3 ruby spheres and 2 sapphire spheres. A sphere is drawn at random. Its color is noted, and it is returned to the box along with 2 additional spheres of the opposite color. A second sphere is then drawn. What is the probability that this second sphere is a ruby?
A box contains 3 ruby spheres and 2 sapphire spheres. A sphere is drawn at random. Its color is noted, and it is returned to the box along with 2 additional spheres of the opposite color. A second sphere is then drawn. What is the probability that this second sphere is a ruby?