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why 0 is called an impossible event
An impossible event is, when the event does not contain any element of the sample space.

For example, the event A="get a 7" on throwing a dice of six faces, or B="get a white ball" from an urn that only contains black balls.

Usually, these events are represented with A=B=?, which is the empty set, or in other words, we are saying that there is no possible result that satisfies the event.f an event is impossible and will never occur, the probability is 0.  

If an event is impossible and will never occur, the probability is 0. 
That is why 0 is called an impossible event


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