To understand A subset B we will draw a figure
That means A is inside be
Then the intersection between A and B should happen in A
Since P(A) = 0.28
Since p(B) = 0.45
Then
[tex]P(A\cap B)=P(A)=0.28[/tex]To find A union B we will add A and B but since A is inside B, then we will not repeat it, then it should be B
[tex]P(A\cup B)=P(B)=0.45[/tex]
