A sample space consists of 9 elementary outcomes whose probabilities are Suppose
(a) Calculate , and
(b) Using the addition law of probability, calculate P (A U B)
A sample space consists of 9 elementary outcomes whose probabilities are Suppose
(a) Calculate , and
(b) Using the addition law of probability, calculate P (A U B)

Solution:
It is given that

(a) We need to find and

Substitute the values, now

Substituting the values,

We now need to find

(b) We need to find