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Question No. 10
In a class of 50 students, 28 students study mathematics and 35 study science. If a student studies at least one subject, then how many students study both mathematics and science?
A) 19
B) 17
C) 15
D) 13

Hi, 
If a student studies at least one subject then n(AUB) = 50 
where A is number of students studying maths and B , science So nA= 28 nB= 35 Now nAB=nA+nB-nABSo number of students studying both nAB=nA+nB- nAB=28+35-50=13

 

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