Three coins are tossed once. Find the probability of getting $2$ heads.

An integer is chosen from the set $\{2k \mid -9 \leq k \leq 10\}$. The probability that the chosen integer is divisible by both $4$ and $6$ is

$A$ problem in statistics is given to three students $A, B$ and $C$. Their probabilities of solving the problem are $\frac{1}{2}, \frac{1}{3}$ and $\frac{1}{4}$ respectively. If all of them try independently,then the probability that the problem is solved is

If $A$ and $B$ are any two events,then the probability that exactly one of them occurs is

The probability of choosing a vowel from the letters of the word $PROBABILITY$ is ........

The probability of obtaining a sum of $8$ in a single throw of two dice is: