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Therefore, the probability that Rex's grandchild is black is between 12% and 32%.
Given that an offspring of a black dog is black with probability 0.6 and brown with probability 0.4, and an offspring of a brown dog is black with probability 0.2 and brown with probability 0.8, knowing that Rex is a brown dog, to determine the probability that his grandchild is black the following calculation must be performed:
Therefore, the probability that Rex's grandchild is black is between 12% and 32%.
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