$A$ coin is tossed $3$ times. The probability of obtaining at least two heads is

$A$ batch of pencils contains $12$ good,$6$ slightly defective,and $2$ very defective pencils. If a pencil is selected at random,what is the probability that it is a non-defective pencil?

Two dice are thrown together. If the numbers appearing on the two dice are different,then what is the probability that the sum is $6$?

In a single throw of two dice,the probability of getting a sum of more than $7$ is

For two events $A$ and $B$,if $P(A \cup B) = \frac{5}{6}$,$P(A) = \frac{1}{6}$,and $P(B) = \frac{2}{3}$,then $A$ and $B$ are:

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