Yes, they cannot happen at the same time. If you flip a coin heads and tails can not come up at the same time.
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Add the probabilities of the two events. If they're not mutually exclusive, then you need to subtract the probability that they both occur together.
The answer will depend on the trial - and possibly the fashion sense!
Two events that cannot occur at the same time are called mutually exclusive.
Yes.
If two events A and B are mutually exclusive, the special rule of addition states that the probability of one or the other event's occurring equals the sum of their probabilities. This rule is expressed in the following formula:Special Rule of Addition(5-2)Equation 5-2