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5. Bean cannot find her probability textbook. She know that either Luci or Elfo has hidden the book and that there is 0.8 probability that Luci hid it. She also knows that Luci hides things upstairs 75 percent of the times and downstairs 25 percent of the times. Elfo, on the other hand, is equally likely to hide the book upstairs or downstairs. (a) What is the probability that the textbook is upstairs? (b) After searching. Bean finds the textbook downstairs. Find the probability that Elfo is the culprit