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1. The meaning of MUTUALLY EXCLUSIVE is being related such that each excludes or precludes the other; also : incompatible.

2.
If two events are mutually exclusive then the probability of both the events occurring at the same time is equal to zero. P(A and B) = 0

If A and B are two mutually exclusive events, then probability of A or B is equal to the sum of probability of both the events.
P(A or B) = P(A) + P(B)

[QUOTE="MathLover1, post: 1103820, member: 280"] 1. The meaning of MUTUALLY EXCLUSIVE is [B]being related such that each excludes or precludes the other[/B]; also : [B]incompatible[/B]. 2. If two events are mutually exclusive then [B]the probability of both the events occurring at the same time is equal to zero[/B]. [B]P(A and B) = 0 [/B] If A and B are two mutually exclusive events, then probability of A or B is equal to the sum of probability of both the events. [B]P(A or B) = P(A) + P(B)[/B] [/QUOTE]