The probability that a marksman will hit a target is given as $1/5$. Then his probability of at least one hit in $10$ shots is:

$A$ can solve $90 \%$ of the problems given in a book and $B$ can solve $70 \%$. What is the probability that at least $1$ of them will solve a problem selected at random from the book?

Two persons each make a single throw with a die. The probability they get equal value is ${p_1}$. Four persons each make a single throw and the probability of three being equal is ${p_2}$,then:

Two dice are thrown simultaneously. The probability of getting the sum $2$,$8$,or $12$ is

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

$A$ box contains $10$ red balls and $15$ green balls. If two balls are drawn in succession,then the probability that one is red and the other is green is: