27. In a medical examination of students of a class

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27. In a medical examination of students of a class, the following blood groups are recorded: A student is selected at random from the class. The probability that he/she has blood group B, is :
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27. In a medical examination of students of a class, the following blood groups are recorded: A student is selected at random from the class. The probability that he/she has blood group B, is : 27. In a medical examination of students of a class is the following blood groups are recorded: A student is [...]
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