Four dice (six-faced) are rolled. The number of possible outcomes in which at least one die shows $2$ is

Events $E$ and $F$ are such that $P(\text{not } E \text{ and not } F) = 0.25$. State whether $E$ and $F$ are mutually exclusive.

$A$ coin is tossed twice. The probability of getting head both the times is

Two dice are thrown together. The probability that at least one will show its digit $6$ is

Three persons $P, Q$ and $R$ independently try to hit a target. If the probabilities of their hitting the target are $\frac{3}{4}, \frac{1}{2}$ and $\frac{5}{8}$ respectively,then the probability that the target is hit by $P$ or $Q$ but not by $R$ is

In a single throw of a fair die,what is the probability of getting a number less than $7$?