Problem 5. Let A, B and C be pairwise disjoint subsets of the sample space.
For each one of the following statements, determine whether it is true or false.
Note: \"False\" means \"It is not always true.\"
(a) $P(A^c) + P(B) \le 1$
(b) $P(A) + P(B) \le 1$
(c) $P(A \cup B \cup C) \ge P(A \cup C)$
Problem 6. A certain system can experience three different types of defects.
Let $A_i$ (i= 1,2,3) denote the event that the system has a defect of type i.
Suppose that
$P(A_1) = 0.12$, $P(A_2) = 0.07$, $P(A_3) = 0.05$
$P(A_1 \cup A_2) = 0.13$, $P(A_1 \cup A_3) = 0.14$, $P(A_2 \cup A_3) = 0.10$,
$P(A_1 \cap A_2 \cap A_3) = 0.01$.
a. What is the probability that the system does not have a type 1 defect?
b. What is the probability that the system has both type 1 and type 2
defects?
c. What is the probability that the system has both type 1 and type 2
defects but not a type 3 defect?
d. What is the probability that the system has at most two of these defects?