Urn 1 contains 4 red balls and 3 black balls. Urn 2 contains 1 red ball and 3 black balls. Urn 3 contains 4 red balls and 2
black balls. If an urn is selected at random and a ball is drawn, find the probability that it will be red.
Enter your answer as a fraction in simplest form or a decimal rounded to 3 decimal places.
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