78 cities were surveyed to determine sports teams. 22 had baseball,16 had rugby, 14 had basketball, 8 had baseball and rugby, 9 had baseball and basketball, 7 had rugby and basketball.3 had all three.   let a = baseball b = rugby c= baseball   how many had only a baseball team? how many had baseball or rugby? how many had baseball or rugby, but not basketball?

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78 cities were surveyed to determine sports teams.
22 had baseball,16 had rugby, 14 had basketball, 8 had baseball and
rugby, 9 had baseball and basketball, 7 had rugby and basketball.3 had all three.
 
let a = baseball
b = rugby
c= baseball
 
how many had only a baseball team?
how many had baseball or rugby?
how many had baseball or rugby, but not basketball?
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