Two cards are drawn from a pack of $52$ cards. What is the probability that at least one of the cards drawn is an ace?

$A$ can solve $90 \%$ of the problems given in a book and $B$ can solve $70 \%$. What is the probability that at least $1$ of them will solve a problem selected at random from the book?

For a biased die,the probabilities for different faces to turn up are given below:

$Face$	$1$	$2$	$3$	$4$	$5$	$6$
$Probability$	$0.1$	$0.32$	$0.21$	$0.15$	$0.05$	$0.17$

The die is tossed and you are told that either face $1$ or $2$ has turned up. Then the probability that it is face $1$ is:

$A$ card is drawn at random from a pack of $52$ cards. The probability that the drawn card is a court card,i.e.,a jack,a queen,or a king,is

For two events $A$ and $B$,if $P(A) = P(A|B) = \frac{1}{4}$ and $P(B|A) = \frac{1}{2}$,then

In a single throw of two dice,the probability of obtaining a total of $7$ or $9$ is: