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

$A$ man alternately tosses a coin and throws a dice,beginning with the coin. The probability that he gets a head in the coin before he gets a $5$ or $6$ in the dice is

$A$ die is thrown. Find the probability of the following event: $A$ number less than $6$ will appear.

$A$ 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 $P(A \cup B)$.

Three coins are tossed together,then the probability of getting at least one head is

What is the probability of having $53$ Sundays in a non-leap year?