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Q.

In a class of 35 students, 17 have taken Mathematics, 10 have taken Mathematics but not Economics. If each student has taken either Mathematics or Economics or both, then the number of students who have taken  Economics but not Mathematics is
 

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answer is 18.

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Detailed Solution

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n(M)=17,n(M∩E)=10 n(M∪E)=35,n(M∩E)=7,n(M¯∩E)=18 

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