If three dice are thrown together,then the probability of getting $5$ on at least one of them is

The probability that a person who undergoes a certain operation will survive is $0.2$. If $5$ patients undergo similar operations,then the probability that exactly four will survive is

In a tournament,a team plays $10$ matches with probabilities of winning and losing each match as $\frac{1}{3}$ and $\frac{2}{3}$ respectively. Let $x$ be the number of matches that the team wins,and $y$ be the number of matches that the team loses. If the probability $P(|x-y| \leq 2)$ is $p$,then $3^9 p$ equals....................

In a Binomial distribution $B(n, p)$,the sum and product of the mean and the variance are $5$ and $6$ respectively,then $6(n+p-q)=$

In a binomial distribution $B(n, p = 1/4)$,if the probability of at least one success is $\geq 9/10$,then $n \geq$ ?

If $X \sim B(n, p)$ with $n = 10, p = 0.4$,then $E(X^2) =$