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25-01-2017
Mathematics

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A bag of marbles is shown below: what is the probability of getting a striped marble first and not returning it then getting a black marble?

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25-01-2017

The odds are the ratio of the probability of choosing a grey marble to that of not choosing a grey marble. Probability of choosing a grey marble = 7/10 Probability of not choosing a grey marble = 3/10 Therefore the odds in favor of choosing a grey marble = 7 : 3

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