The probability of an event that cannot happen is__________. Such an event is called __________

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Step 1: Recall the impossible event.
An impossible event is an event that cannot happen.
E is an impossible event if and only if P(E) = 0.
EXAMPLE:
In flipping a coin once, an impossible event would be getting BOTH a head AND a tail.
The probability of an event that cannot happen is ZERO.Such an event is called IMPOSSIBLE event.