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Mathematics, 14.10.2019 10:30 keasiabradley
There are some blue and red counters in a bag in the ratio 1: 3. two counters are taken at random. the probability of both counters being blue is 1/20. how many counters were in the bag?
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There are some blue and red counters in a bag in the ratio 1: 3. two counters are taken at random. t...
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