A premise can turn into a lie

 

Consider two events A and B in a sample space, where P(X) is the probability of an event X occurring. It is known that: P( A ∪ B ) = 0.8; P( A ∩ B) = 0.7; and P(A) = 0.6. What is the probability of B occurring?

A) 0,45

B) 0,55

C) 0,75

D) 0,85

E) 0,90

Who solved do that way: P(A∪B) = P(A) + P(B) - P(A∩B) But 

But say the yellow part could be 0,9 bigger than the conjunto Universe? You know why you gonna got to that absurd, is even imoral becuase the pink area is negative, where probalities are pure mathemaitcs to you act like that? Ham I think was descuido, and that was a test to people got a public work in Brazil.

Rute Bezerra de Menezes Gondim