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A box contains 5 white balls, 7 black balls, and 4 red balls. How many red balls must be added to the box so that
A box contains 5 white balls, 7 black balls, and 4 red balls. How many red balls must be added to the box so that the probability of drawing a red ball is 7/8?
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A Survey Of Mathematics With Applications
Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde
11th Edition
0135740460, 978-0135740460
