Lets first work out the probability of RRRRRRRBBBBB The First being a red = 41/60 There now remain 59 marbles in the bag and 40 are red. Firstly working out the probability of a typical string of 7 red and 5 blue and then secondly the number of ARRANGEMENTS there are of 7 red and 5 blue. I am going to assume the marbles are not replaced. There are 60 total marbles -There are 41 red marbles. ![]() ![]() ![]() If 12 marbles from 60 are chosen at random what is the probability of selecting exactly 7 red marbles.
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