A) 373
B) 165
C) 370
D) 394
Correct Answer: A
Solution :
[a]We know, for two sets A and B \[A-B=A-(A\cap B)\] \[\therefore n(A-B)=n(A)-n(A\cap B)\] Given, \[n(A)=115,n(B)=326\] and \[n(A-B)=47.\] \[\Rightarrow 47=115-n(A\cap B)\] \[\Rightarrow n(A\cap B)=68\] Consider \[n(A\cup B)=n(A)+n(B)-n(A\cap B)\] \[=115+326-68=373\]You need to login to perform this action.
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