Two dice are thrown. The probability that the sum of the points on two dice will be $7$ is:

$A$ card is drawn at random from a well-shuffled pack of $52$ cards. The probability that it is a black card or a face card is

The probabilities that $A$ and $B$ will die within a year are $p$ and $q$ respectively. Then,the probability that only one of them will be alive at the end of the year is

An experiment consists of rolling a die and then tossing a coin if the number on the die is even. If the number on the die is odd,the coin is tossed twice. Write the sample space for this experiment.

Two dice are thrown simultaneously. What is the probability of obtaining a sum of the numbers less than $11$?

If in a lottery there are $5$ prizes and $20$ blanks,then the probability of getting a prize is