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     EduGorilla 
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    In a survey of 200 students of a higher secondary school, it was found that 120 studied Mathematics, 90 studied Physics, 70 studied Chemistry, 40 studied Mathematics and Physics, 30 studied Physics and Chemistry, 50 studied Chemistry and Mathematics and 20 studied none of these subjects. Find the number of students who studied all the three subjects.

    Options :-

    1. 10
    2. 20
    3. 0
    4. 40
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