$A$ bag contains tickets numbered from $1$ to $20$. Two tickets are drawn. The probability that both the numbers are prime,is

$A$ bag contains $9$ identical black balls numbered $1$ to $9$ and $4$ identical white balls numbered $1$ to $4$. If $3$ balls are drawn at a time randomly from that bag,then the probability of getting at least one white ball is

$A$ deck consists of $4$ Aces,$4$ Kings,$4$ Queens,and $4$ Jacks. If $2$ cards are drawn at random from this deck of $16$ cards,what is the probability that at least one card is an Ace?

$5$ boys and $5$ girls are sitting in a row randomly. The probability that boys and girls sit alternatively is

$A$ bag contains $6$ red,$2$ white and $8$ blue balls. Three balls are drawn at random from the bag. Match the items of List-$I$ with those of List-$II$.

$A$. Probability that none of the balls is white	$I$. $\frac{1}{70}$
$B$. Probability of getting $2$ white and $1$ blue ball	$II$. $\frac{6}{35}$
$C$. Probability of getting $2$ blue and $1$ white ball	$III$. $\frac{13}{20}$
$D$. Probability of getting $1$ red,$1$ white and $1$ blue ball	$IV$. $\frac{1}{10}$

Two distinct numbers $a$ and $b$ are selected at random from ${1, 2, 3, \dots, 50}$. The probability that their product $ab$ is divisible by $3$ is: