Two dice are thrown together. The probability that at least one will show its digit $6$ is

Three coins are tossed once. Find the probability of getting $3$ tails.

Three athletes $A, B$ and $C$ participate in a race competition. The probability of winning for $A$ and $B$ is twice the probability of winning for $C$. Then the probability that the race is won by $A$ or $B$ is:

$A$ fair die is rolled once. Let $A$ be the event of getting an integer greater than $3$ and $B$ be the event of getting an integer less than $5$. Find $P(A \cup B)$.

In a single throw of a fair die,what is the probability of getting a number less than $7$?

$2$ boys and $2$ girls are in Room $X$,and $1$ boy and $3$ girls are in Room $Y$. Specify the sample space for the experiment in which a room is selected and then a person.