Question

Find the indicated probability
If P(B) = 0.5, P(A or B) = 0.3, and P(A and B) = 0.6.

P(A) =

Answer 1

note that p(A & B) = p(A) + p(B) - p(A or B)

Answer 2

no i think you have it backwards
P(A or B) = P(A) + P(B) - P(A and B)

--> P(A) = 0.3 + 0.6 -0.5

Answer 3

these probabilities don't make sense in real world application

Answer 4

@dumbcow have it backwards? what do you mean..
what you wrote and what i wrote is the same thing..just a slight shuffle..

Answer 5

oh i see, you were right
i never think of it that way, normally P(A or B) > P(A and B)

Answer 6

hmmn..