$A$ bag contains $3$ white and $5$ black balls. If one ball is drawn, then the probability that it is black, is

$A$ bag contains $4$ white,$5$ red,and $6$ blue balls. Three balls are drawn at random. What is the probability that all of them are red?

Two dice are thrown. The probability that the sum of numbers appearing is more than $10$ is:

$3$ coins are tossed. Find the probability of getting at least $2$ heads.

$A$ mapping is selected at random from the set of all the mappings of the set $A = \{1, 2, ..., n\}$ into itself. The probability that the mapping selected is an injection is

The sum of two positive numbers is $100$. The probability that their product is greater than $1000$ is