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Question

In a medical examination of students of a class, the following blood groups are recorded.

Blood groupA+ABBO+Number of1013125students

A student is selected at random from the class. The probability that he/she has blood group B is:

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Solution

Total number of students in the medical examination, n(S) = 40
Number of students who have B blood group, n(E) = 12
Probability that he/she has blood group B =n(E)n(S)=1240=310

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