Answer :

For this type of question, we recall the following:

[tex]P(A\cup B)=P(A)+P(B)-P(A\cap B)[/tex]

From the Venn diagram, we have that

[tex]P(A\cap B)=0.10[/tex]

Substituting P(A) = 0.4 and P(B)= 0.3 we get:

[tex]P(A\cup B)=0.4+0.3-0.1=0.6[/tex]

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