Mark the correct alternative in each of the following:
If A and B are two events such that P(A) = 0.4, P(B) = 0.3 and P(A ∪ B) = 0.5, then equals.
P(A) =0.4 , P(B) =0.3 , P(A⋃B) = 0.5 → (Given)
Now, according to the addition theorem of probability,
P(A⋃B) = P(A) + P(B) – P(A⋂B)
0.5 = 0.4 + 0.3 – P(A∩B)
P(A∩B) = 0.7 – 0.5
P(A∩B) = 0.2 → (1)
Now according to the image:
P = P(A) – P(A⋂B)
= 0.4 – 0.2
= 0.2