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Answers for “为什么概率非零的互斥事件通常不是独立的?”

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Understand why

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Mutually exclusive events cannot occur simultaneously. If event A occurs, event B is guaranteed not to occur, meaning the occurrence of A directly affects the probability of B.

Conditions: Events A and B are mutually exclusive (AB=∅AB = \emptyset).; The probability of event A is greater than 0 (P(A)>0P(A) > 0).; The probability of event B is greater than 0 (P(B)>0P(B) > 0).

Find a method

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By defining heads and tails as two events in a single coin toss, they are mutually exclusive because they cannot happen simultaneously. Knowing that one outcome occurred changes the probability of the other to zero, proving they are dependent, not independent.

Conditions: A single toss of a fair coin.; Event A is 'heads up' and Event B is 'tails up'.

Meet the concept

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Yes, the impossible event (the empty set) is independent of any event. Because its probability is 0, the probability of its intersection with any event is 0, which perfectly satisfies the mathematical definition of independence.

Conditions: Event B is the impossible event (B=∅B = \emptyset).; Event A is any arbitrary event.

Meet the concept

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Two events are mutually exclusive if their intersection is the empty set, meaning they cannot occur simultaneously in the same random experiment.

Conditions: Events A and B are two events in the same random experiment.