Answers

2015-07-14T17:17:34+05:30
Obviously if A and B are disjoint set so their is no common element between A and B so 
if there is no common element between A and B then n(AυB)=n(A)+n(B)
i.e no of element of set A plus the no of element of set B
i hope you understand  have attached a image for you to upgrade your concept of set
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