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in a class of 40 students, all play at least one sport. if 21 students play basketball, 18 play soccer, 15 play volleyball, and 6 students play exactly two sports, then how many play all three sports?
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in a class of 40 students, all play at least one sport. if 21 students play basketball, 18 play soccer, 15 play volleyball, and 6 students play exactly two sports, then how many play all three sports?

User Erik Van Oosten
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20 students play all three sports
User Polyana Fontes
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