$A$ card is selected from a pack of $52$ cards. Calculate the probability that the card is a black card.

Three dice are thrown simultaneously. What is the probability of obtaining a total of $17$ or $18$?

$A$ number $n$ is chosen at random from the natural numbers $2$ to $1001$. The probability that $n$ is a number that leaves remainder $1$ when divided by $7$ is:

When a pair of six-faced fair dice are thrown, the probability that the sum of the numbers on the two dice is greater than $7$ is:

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

Six faces of an unbiased die are numbered with $2, 3, 5, 7, 11$ and $13$. If two such dice are thrown, then the probability that the sum on the uppermost faces of the dice is an odd number is