$4$ coins are tossed once. Find the probability of getting exactly $3$ tails.

Find the probability that a two-digit number formed by the digits $1, 2, 3, 4, 5$ is divisible by $4$ (repetition of digits is allowed).

There are $10$ pairs of shoes in a cupboard from which $4$ shoes are picked at random. The probability that there is at least one pair is

$A$ positive integer is selected at random and is divided by $9$. What is the probability that the remainder is not $1$?

If a number of two digits is formed with the digits $2, 3, 5, 7, 9$ without repetition of digits,what is the probability that the number formed is $35$?

An integer is chosen at random and squared. The probability that the last digit of the square is $1$ or $5$ is