Lydia wants to find the height of a flagpole. She measures the height of a tree and the length of the shadow it casts. The tree
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From the Venn diagram, we can gather that there are 35 total objects (6 in both A and B; 15 in A but not B; 10 in B but not A; and 4 in neither A nor B), and we have the probabilities
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By definition of conditional probability,