A) \[n(A)+n(B)\]
B) \[n(A)+n(B)-n(A\cap B)\]
C) \[n(A)+n(B)+n(A\cap B)\]
D) \[n(A)\,n(B)\] \[n(A)-n(B)\]
Correct Answer: B
Solution :
\[n(A\cup B)=n(A)+n\,(B)-n(A\cap B)\].
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