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If the triangle represents doctors, the circle represents teachers and the rectangle represents film-makers in the following diagram
Then which numbers represent teachers who are neither doctors nor film-makers ?
We want teachers (elements that are part of the circle), but those who are not Doctors (part of the triangle), and not filmmakers (part of the rectangle).
2, 5, 7, and 3 are part of the circle, and hence are the teachers.
7 is a teacher and a doctor, and hence should not be considered.
3 is a teacher and a filmmaker, and would also be eliminated.
Leaving only 2 and 5 that satisfy our condition.
Therefore, Option D is the correct answer.
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