Question 744599
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P(A) = 0.40; P(B) = 0.25; the probability of both events occurring is 0.15. 
What is the probability of either event occurring?
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This question is about P(A U B).


Use the standard formula  P(A U B) = P(A) + P(B) - P(A and B).

Substitute the given values

    P(A U B) = 0.40 + 0.25 - 0.15 = 0.50.    <U>ANSWER</U>
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Solved.


The answer in the post by @lynnlo is incorrect.