In a survey of 200 students of a school, it was found that
120 study mathematics, 90 study physicsand 70 study
chemistry. 40 study mathematics and physics , 30 study
physics and chemistry, 50 study chemistry and mathematics and 20 none of these subjects. Find the number
of student who study all the three subjects.
Answers
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the number of students studying all three subjects is 20.
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