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History shows that the powerhouses NCAA basketball teams have a higher probability of being in the championship game. Over the last 20 years the Atlantic Coast Conference (ACC) has been in the national championship game 10 times. The Southeastern Conference (SEC) has been in the championship game 8 times. However, as good as these conferences are, both conferences have played each other in the championship game only once. What is the probability at least one team from these two conferences will be in the championship game this year?