Question 1143525
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4.1
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<pre>
If A and B are mutually exclusive events, then

    P(A or B) = P(A) + P(B).



If A and B are independent events, then

    P(A or B) = P(A) + P(B) - P(A)*P(B).
</pre>


4.2
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The formulation is DEFECTIVE.


Check it with your source;  &nbsp;then fix and re-edit;  &nbsp;then re-post to the forum.




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Instead of packing many problems in one post inaccurately, you better submit one problem per post accurately (!)