In the following diagram, there are three circles. Study the diagram carefully and answer the given question. (Top circle: Doctor; bottom-left circle: Indian; bottom-right circle: Teacher) Find the teachers who are neither doctors nor Indians.
7
7 is correct.
In the diagram the top circle stands for doctors, the bottom-left circle for Indians and the bottom-right circle for teachers. The numbers 1 to 7 are labels of the regions.
The teachers' circle is made up of regions 3, 4, 6 and 7.
Region 3 also lies inside the doctors' and the Indians' circles, region 4 also lies inside the doctors' circle, and region 6 also lies inside the Indians' circle, so these three regions are ruled out.
Region 7 lies only inside the teachers' circle, so the teachers who are neither doctors nor Indians are represented by region 7.
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