In a well-shuffled deck of $52$ cards,if two cards are drawn at random,what is the probability that both cards are kings?

$A$ three-digit number is formed by using the digits $1, 2, 3,$ and $4$ without repetition. The probability that the number is divisible by $3$ is:

$A$ bag contains $5$ brown and $4$ white socks. If a man draws $2$ socks,what is the probability that they are of the same color?

$A$ bag contains $5$ brown and $4$ white socks. $A$ man pulls out two socks. The probability that these are of the same colour is

Out of $30$ consecutive numbers,$2$ are chosen at random. The probability that their sum is odd,is

$A$ box contains $8$ red and $x$ number of green balls. $3$ balls are drawn at random. If the probability that all $3$ balls are red is $\frac{7}{15}$,then the number of green balls $x$ is: