math
posted by Mike .
A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below.
43 said they drove alone.
34 rode in a carpool.
28 rode public transportation.
4 used both carpools and public transportation.
7 used both a carpool and sometimes their own cars.
6 used buses as well as their own cars.
2 used all three methods.
How many are using all three?
_____ students

"2 used all three methods."
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