Out of 30 students in a dormitory, 15 take an art course, 8 take a
biology course and 6 take a chemistry course. It is known that 3
students take all the three courses. Show that 7 or more students take
none of the courses
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Answer:
8 students take none of the courses
Step-by-step explanation:
art course - 15
biology course - 8
chemistry - 6
all 3 courses - 3
total = 30- 15+8+6+3
30- 22
8
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