In a class, 36 students offered Physics, 46 offered Chemistry and 48 offered Mathematics. Of these, 26 are in both Chemistry and Mathematics, 24 are in both Physics and Chemistry, 22 are in both Physics and Mathematics. 12 have offered all the three subjects. Find: a) the number of students in the class. b) the number of students who have offered Mathematics but not Chemistry. c) the number of students who have offered exactly one subject.
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the number of students in class
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