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Probability 20 Online
OpenStudy (anonymous):

21students at school are allergic to peanuts, shellfish, or both. 14 students are allergic to peanuts. 12 students are allergic to shellfish. How many are allergic to both?

OpenStudy (zpupster):

21 students have allergies but 14 to peanuts and 12 to shellfish = 26 26-21=allergic to both

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