During fiscal 1995, Ashland Exploration drilled 7 wells in the United States and 3 in Nigeria. One

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During fiscal 1995, Ashland Exploration drilled 7 wells in the United States and 3 in Nigeria. One of the wells in Nigeria was productive and 2 of the wells in the United States were productive. The remaining wells were dry. For a well selected at random from those drilled during fiscal 1995, determine the following probabilities:
a. P(drilled in the United States)
b. P(drilled in the United States or dry)
c. P(dry | drilled in Nigeria)
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