If P(A or B) = 0.5, P(A) = 0.2 and P(B) = 0.7, determine P(A and B).

Answer 1

P(A or B) = P(A)+P(B)-P(A and B)

.5 = .2 + .7 - x

x = 0.4

Hey, these formulas are in your text I am sure.

Answer 2

P(A or B) = P(A) + P(B) - P(A and B)
sub in your values

Answer 3

yes i have seen the examples of the formula but was still very confused...thanks you two :)