# A and B are two events such that $P(A) > 0, P(B) \neq 1$ then $P( \overline A / \overline B )=$

$\begin {array} {1 1} (A)\;1-P(A/B) & \quad (B)\;1-P ( \overline A / B ) \\ (C)\;\large\frac{1-P(A \cup B)}{P(\overline B)} & \quad (D)\;\large\frac{P( \overline A)}{P( \overline B )} \end {array}$

$P( \overline A / \overline B) = \large\frac{P(\overline A \cap \overline B )}{P( \overline B )}$
$= \large\frac{( \overline{A\cup B})}{P( \overline B)}$
$= \large\frac{1-P(A \cup B )}{P(\overline B)}$
Ans : (C)