Question

in the cafeteria, 52 students were seated at tables. 26 were enrolled in psychology, 19 were enrolled in physics, and 6 were enrolled in both. How many students were enrolled in psychology only?

Answer 1

27 students

Answer 2

26 students and one student leftover could be in neither

Answer 3

given 26 in psychology and 6 with both then it should be 26-6 = 20 in psychology only
additionally, 52 students seated 13 should be neither psychology or physics
with this view 13 students are in other than psychology or physics