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 Amsco Integrated Algebra I: The Probability of (A or B)
This is a free lesson from our course in Amsco's Integrated Algebra
This lesson explains how to find probability for the shared outcome of events A or B i.e. P (A or B). In the case of the shared outcomes of events A and B:
(A and B) = n (A Ω B)/ n(S).
If two events A and C are mutually exclusive:
P(A or C) = P(A) + P(C).
If two events A and B are not mutually exclusive:
P(A or B) = P(A) + P(B) - P(A and B)  (More text below video...)
<h2> The Probability of (A or B)</h2> <p> monomial,video,quizzes,practice questions,The Probability of (A or B), Fractional Coefficients, Evaluating Simple Probabilities, Empirical Probability, amsco,integrated,algebra1</p> <p> explains what is The Probability of (A or B)</p>
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(Continued from above)Each probability is a number between zero (the event will not happen in any trial) and one (the event will surely happen in every trial) and the sum of the probabilities of all possible singleton outcomes for any sample space must always equal 1, i.e. for any event A: P(A) + P(not A) = 1. For example: Examine three events that occur when a die is rolled.
Event A= {an even number} = {2, 4, 6}.
Event B= {a number less than three} = {1, 2}
Event C= {a number less than two} = {1}
Since A and C are mutually exclusive:
P (A or C) =P (A) +P(C) =3/6+1/6=4/6=2/3. A and B are not mutually exclusive: P(A or B)=P(A)+P(B)-P(A and B)=3/6+2/6-1/6=4/6=2/3..


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