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Thread: probability help

  1. #1 probability help 
    Forum Freshman
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    hi guys i need a little help with probability specifically I want to understand the probability when there are 3 non mutually exclusive events like A, B and C. How will we find probability for an event A&B but not C? the 3 events can also occur simultaneously.
    Thanks in advance


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  3. #2  
    Forum Cosmic Wizard
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    You multiply the probabilities instead of adding them.

    P ( A or B ) = P ( A ) + P ( B ) − P ( A and B )


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  4. #3  
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    multiply what?? a single event has the condition that A&B will occur while C won't
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  5. #4  
    Forum Cosmic Wizard
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    Quote Originally Posted by fine View Post
    multiply what?? a single event has the condition that A&B will occur while C won't
    P(A or B or C) = P(A) + P(B) + P(C) - P(AB) - P(AC) - P(BC) + P(ABC)
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  6. #5  
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    p(A n B n C')=?
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  7. #6  
    Forum Professor jrmonroe's Avatar
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    Does it makes sense that P(X) + P(not X) = 1?
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    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  8. #7  
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    yes i know
    p(x)+P(not x)=1 but how do i apply it here???
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  9. #8  
    Forum Radioactive Isotope MagiMaster's Avatar
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    You're looking for P(A and B and (not C)). You can use that to find P(not C).
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