OpenStax, Statistics §3.5 Tree and Venn Diagrams · Example 10 · Combinatorics · Sets & logic

Tree and Venn Diagrams · Example 6

c. Because this is a conditional probability, we restrict the sample space to consider only those outcomes that have a blue marble in the first draw. Look at the second level of the tree to see that P(R on 2nd|B on 1st) = $\frac{3}{10}$

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OpenStax, Statistics · §3.5 Tree and Venn Diagrams · Example 10

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