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A 03/11/2016 in Class IX-X Tuition, Mathematics(Class IX-X Tuition), Sets

A survey of 200 students of a school, it was found that 120 study Mathematics, 90 study Physics and 70 study Chemistry, 40 study Mathematics and Physics, 30 study Physics and Chemistry, 50 study Chemistry and Mathematics an 20 none of these subjects. Find the number of students who study all the three subjects?

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Avinash 27/10/2016 in Number System, Class IX-X Tuition, Mathematics(Class IX-X Tuition)

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Manisha 29/10/2016 in Class IX-X Tuition, Mathematics(Class IX-X Tuition), Circles

Anil 03/11/2016 in Class IX-X Tuition, Mathematics(Class IX-X Tuition), Sets

Write the set in the roaster form: A = {x : x belongs to R, 2x + 11 = 15}?