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Green Valley High School recently completed an expansion. Of the new classrooms, 11 are math classrooms, 8 are science classrooms, and 6 are history classrooms.

Green Valley High School recently completed an expansion. Of the new classrooms, 11 are math classrooms, 8 are science classrooms, and 6 are history classrooms. If a single classroom is picked at random, what is the probability that the classroom is for math or history

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