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Two events E_{1} and E_{2} are defined for a random experiment. What is the probability that at least one of the two events occurs in any trial of the experiment? P(E 1 )-P(E 2 )-P(E 1 cap E 2 ) B. P(E 1 )+P(E 2 )+P(E 1 cap E 2 ); P(E 1 )+P(E 2 )-P(E 1 cap E 2 ) D. P(E 1 )+P(E 2 )-2P(E 1 cap E 2 )