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OpenStudy (anonymous):
In a class, 22 students have been on a plane, 28 on a train, 23 on a boat, 15 on a plane and train, 20 on a train and boat, 14 on a plane and boat, 12 on all three, and 1 on none of them. How many students are in the class? a. 37 c. 26 b. 38 d. 40
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OpenStudy (dumbcow):
use Ven Diagram |dw:1384979990376:dw|
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