Discussion
Which of the following diagrams shows the correct relationship among :
Boys, Students, Girls
- A.
- B.
- C.
- D.
Answer: A
The correct diagram is (A): three circles in a row, the middle one overlapping both outer ones.
Let the middle circle be Students. Some boys are students and some are not, so the Boys circle overlaps Students without lying inside it; the same holds for Girls. No one is both a boy and a girl, so the Boys and Girls circles do not touch. That is exactly diagram (A).
Diagram (B) would put all boys and all girls inside Students, which is too strong. (C) nests the three sets inside one another, and (D) makes the two inner sets overlap, which would mean some boys are girls.
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