Three numbers are selected randomly between $1$ to $20$. Then,the probability that they are consecutive numbers will be

$A$ bag contains $4$ white,$5$ red and $6$ black balls. If two balls are drawn at random,then the probability that one of them is white is

$A$ bag contains $6$ white,$7$ red,and $5$ black balls. If $3$ balls are drawn from the bag at random,then the probability that all of them are white is

Three numbers are chosen at random without replacement from the set $A = \{x \in \mathbb{Z} \mid 2 \leq x \leq 11\}$. The probability that the minimum of the chosen numbers is $3$ and the maximum is $7$ is

The probability that the sum of $2$ numbers chosen at random from $30$ consecutive integers is odd is..........

$4$ boys and $2$ girls occupy seats in a row at random. The probability that the two girls occupy seats side by side is: