In a class of 35 students it is known that 24 of them do arts, 20 do chemistry and 22 do biology. All the students do at least one of the 3 subjects, 3 do all the three subjects while 7 do art and biology. 6 do art and chemistry but not biology and 8 do chemistry and biology. How many of them do chemistry or biology only or arts only?
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In a class of 45 students
It is known that 24 of them do arts, 20 do chemistry and 22 do biology.
3 do all the three subjects
7 do art and biology
6 do art and chemistry but not biology
8 do chemistry and biology
Then
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