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Let A and B be two sets such that n(A) =20 , n(A∪B)=42 nd n(A∩B)=4 Find n(B), n(A-B) and n(B-A)

Posted by Sreehari J 1 year, 1 month ago

CBSE > Class 11 > Mathematics

1 answers

Preeti Dabral 1 year, 1 month ago

Solution is given below:

{tex}\begin{aligned} & n(A \cup B)=n(A)+n(B)-n(A \cap B) \\ & n(B)=42-20+4=26 \\ & n(A-B)=n(A)-n(A \cap B)=20-4=16 \\ & n(B-A)=n(B)-n(A \cap B)=26-4=22 \end{aligned}{/tex}

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CBSE > Class 11 > Mathematics