Question

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

Answer 1

The events included here are non-mutually exclusive. this means the two have common elements that exist between them. The general addition rule that applies to the given data is as follows:

P(A or B) = P(A) + P(B) - P(A and B)
 0.3 = P(A) + 0.5 - 0.6  
P(A) = 0.4