Paper 1 · Mathematical Reasoning and Aptitude
(a)ProfessorsDoctorsMen(b)MenDoctorsProfessors(c)ProfessorsDoctorsMen(d)ProfessorsDoctorsMenWhich diagram best represents the relation between professors, doctors and men?
AThree fully separate circles
BOne circle inside another inside a third
CThree mutually intersecting circles ✓ Correct
DTwo intersecting circles and one separate
Correct answer: (C) Three mutually intersecting circles — Three mutually intersecting circles is the best diagram, so that is the answer.
Explanation
★Three mutually intersecting circles is the best diagram, so that is the answer.
★A person may be both a professor and a doctor, so those two groups overlap.
★Some professors are men and some doctors are men, but not all of either are men.
★So the group of men overlaps both professors and doctors without containing them fully.
★This is shown by three circles that all cut across one another.
★So the answer is three mutually intersecting circles.
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