Math 104
posted by DEE .
A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows:
34 said they drove alone.
24 rode in a carpool.
28 rode public transportation.
3 used both carpools and public transportation.
3 used both a carpool and sometimes their own cars.
5 used buses as well as their own cars.
1 used all three methods.
How many used none of the abovementioned means of transportation?

Number(A OR B OR C)
=NUMBER(A) + NUMBER(B) + Number(C)  Number(A AND B)  Number(A OR C)  Number(B AND C) + Number(A AND B AND C)
= 34+24+28  3  3  5 + 1
= 76
So 24 are not accounted for, they must have used none of the above
You could also use Venn diagrams
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