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In a class of 50 students 18 offered mathematics 21 offered chemistry and 16 offered biology.7 did maths and chem ,8 maths and biology while 9 chemistry and biology and 5 did all the three .find the number of students who did not offer any of the subject combination

In A Class Of 50 Students 18 Offered Mathematics 21 Offered Chemistry And 16 Offered Biology7 Did Maths And Chem 8 Maths And Biology While 9 Chemistry And Biolo class=

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