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In a class of 30 IB students, 20 study mathematics SL,12 study physics and 8 study both of thesesubjects.Find the probability that a randomly selectedstudent

In a class of 30 IB students, 20 study mathematics SL,12 study physics and 8 study both of thesesubjects.Find the probability that a randomly selectedstudent does not study both of these subjects.

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