Thread: probability help

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

You multiply the probabilities instead of adding them.

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

multiply what?? a single event has the condition that A&B will occur while C won't

Originally Posted by fine

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)

p(A n B n C')=?

Does it makes sense that P(X) + P(not X) = 1?

yes i know
p(x)+P(not x)=1 but how do i apply it here???

You're looking for P(A and B and (not C)). You can use that to find P(not C).