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Discussion

Quantitative Ability Preparation for MBA Entrance
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Out of 200 students in a school, 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.

 
10
20
30
None of these

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Shambaditya Mukhopadhyay

180=120 90 70-40-30-50 x; => x=20 (A U B U C)=A B C-(A intersctn B)-(B intersctn C)-(A intersctn C) (A intersctn B intersctn C)

Soham

How??