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mathematics subject English
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Answer:Let U be the set of students who appeared for the exam, E be the set of students who passed in English and M be the set of students who passed in Maths.
Since, none of the students failed in both subjects
∴ Total student = n(E ∪M) = 10 + 40 + 20 = 70
∴ The number of students who passed at least in one of the subjects is 70.
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