Question

Let A, B be two events such that the probability of A is `3/10` and conditional probability of A given B is `1/2`. The probability that exactly one of the events A or B happen equals.

Options

• `1/2`

• `1/6`

• `3/10`

• `7/10`

Answer 1

`bb(1/2)`

Explanation:

Desired probability

= P(A) + P(B) – 2P(A ∩ B)

and `P(A/B) = (P(A ∩ B))/(P(B)) = 1/2`