Question

Event B is dependent on event A, and event A occurs before event B. Which formula can be used to find the probability of event A?

a. P(A and B)
P(B)

b. P(A and B)
P(B|A)

c. P(A and B)
P(A|B)

d. P(A and B) × P(B|A)
e. P(A and B) × P(B)

Answer 1

The right answer for the question that is being asked and shown above is that: "d. P(A and B) × P(B|A)." Event B is dependent on event A, and event A occurs before event B. the formula that can be used to find the probability of event A is P(A and B) × P(B|A)

Answer 2

Option d -
`P(A)=\text{P(A and B)} * P(B|A)`

Explanation:

Given : Event B is dependent on event A, and event A occurs before event B.

To find : Which formula can be used to find the probability of event A?

Solution :

Event B is dependent on event A

i.e. The intersection of A and B - A and B

Probability of event B is dependent on event A is P(A and B)

Event A occurs before event B

i.e. B|A

Probability of event A occurs before event B is P(B|A)

Event B is dependent on event A, and event A occurs before event B is

`\text{P(A and B)} * P(B|A)`

The formula which shows the probability of event A is

`P(A)=\text{P(A and B)} * P(B|A)`

Therefore, Option d is correct.