Final answer:
The probability of the union of two mutually exclusive events can be found by adding their individual probabilities.
Step-by-step explanation:
To find the probability of the union of two mutually exclusive events, you can simply add their individual probabilities. In this case, the probability of event A (p(a)) is 0.1 and the probability of event B (p(b)) is 0.4. Since A and B are mutually exclusive, the probability of A union B (p(a∪b)) is equal to p(a) + p(b) = 0.1 + 0.4 = 0.5.