Mathematics, 25.11.2021 19:50, ashleyremon

A box contains 40 identical discs which are either red or white. If the probability of picking a red disc is 1 over 4. Calculate the number of red disc that should be added so that the probability of picking a red disc is 1 over 3

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A box contains 40 identical discs which are either red or white. If the probability of picking a red...