The probability of event A occurring is 0.5 and of B occurring is 0.3. If A and B are mutually exclusive events then the probability of neither A nor B occurring is___
Solution : 0.2
P(A' UNION B' ) = 1- P(A UNION B)
1-0.8
= 0.2
My Solution : 1
P(A' UNION B' ) = P ( A INTERSECTION B )' using demorgans law
= 1- P ( A INTERSECTION B )
= 1 - 0 ( mutually exclusive )
=1
Which is the correct approach . Please Help