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Is the probability of D for the following determined by multiplying or adding the two probabilities:

style="color:rgb(84,84,84);">(A ∪ B ∪ C) = Ω

The probability is 1/4 for any two of A, B and C occuring at the same time. And the probability of all three (A, B and C) occuring at the same time is 1/8.

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