A study was done to ascertain the effectiveness of a flu vaccine . Two groups of people ( vaccinated and not vaccinated ) were followed during flu season to see how many in each group ended up catching the flu. The results are summarized in the table below :   Vaccinated Not Vaccinated Got Flu 100 200 Did Not Get Flu 300 200 What is the probability that if a person in this study is randomly selected , that person did NOT get the flu ?

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