In a class of 45 students, it is known that 24 of them do Art, 20 do Chemistry and 22 do Biology. All students do at least one of the three subjects. 3 do all the three subjects while 7 do at Art and Biology, 6 do Art and Chemistry but no Biology and 8 do Chemistry and Biology. how many do: a. Biology only or Chemistry only or Art only. b. Two subjects only.
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