# Disjoint

How many elements have union and intersection of two disjoint sets when the first have 1 and secodn 8 elements.

Correct result:

union:  9
intersect:  0

#### Solution:

$n\left(A\cup B\right)=n\left(A\right)+n\left(B\right)=1+8=9$
$n\left(A\cap B\right)=0$

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