Applied Y2 Chapter 2

Question 1

What happens if A and B are independent

Answer 1

P(A) x P(B) = P(A n B)
P(A|B) = P(A)

Question 2

If events A and B are mutually exclusive

Answer 2

P(A n B)= 0
P(A U B)= P(A) + P(B)

Question 3

In general

Answer 3

P(A|B) = P(A n B)/ P(B)

P(A U B) = P(A) + P(B) - P(A n B)

P(A U B) = 1- P(A’ n B’)