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Harry Potter is at Ollivanders Wand Shop. As we all know, the wand must choose...

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Harry Potter is at Ollivanders Wand Shop. As we all know, the wand must choose the wizard, so Harry cannot make the choice himself. He interprets the wand selection as a random process so he can determine the probabilities of different outcomes.The wood types available are holly, elm, maple, and wenge. The core materials on offer are phoenix feather,unicorn hair, dragon scale, raven feather, and thestral tail.Let A be the event that Harry is chosen by a wand made of holly and B be the event that he is chosen by a wand with a dragon scale core.What is P(A or B), the probability that Harry is chosen by a wand made of holly or a wand with a dragon scale core?

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