Question: please help! I need help fully understanding Question 75: Urn 1 contains 2 red balls and 5 black balls. Urn 2 contains 5 red balls

please help! I need help fully understanding

Question 75: Urn 1 contains 2 red balls and 5 black balls. Urn 2 contains 5 red balls and 5 black balls. Urn 3 contains 6 red balls and 3 black balls. If an urn is selected at random and a ball is drawn, find the probability it will be red

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