If $P(A) = 0.65$ and $P(B) = 0.15$,then $P(\bar{A}) + P(\bar{B}) = $

The number of subsets of $\{1, 2, 3, \ldots, 9\}$ containing at least one odd number is

Draw an appropriate Venn diagram for the following: $(A \cup B)'$

Fill in the blanks to make each of the following a true statement:
$A \cup A^{\prime} = \ldots$

Taking the set of natural numbers as the universal set,write down the complement of the following set:
$A = \{ x : x \text{ is a prime number} \}$

If $U = \{a, b, c, d, e, f, g, h\}$,find the complement of the set $C = \{a, c, e, g\}$.