If $P(\overline{B}) = 0.81$,then $P(B) = \ldots$

Two balanced dice are rolled simultaneously. Then,the probability that the sum of numbers on the dice is $2$ is ............

Two unbiased dice are thrown once. Write all the possible outcomes of this experiment. What is the probability that the sum of numbers on two dice is smaller than $2$?

Two balanced dice are rolled simultaneously. Then,the probability that the sum of numbers on the dice is $11$ is .........

Two dice are numbered $1, 2, 3, 4, 5, 6$ and $1, 1, 2, 2, 3, 3$ respectively. They are thrown and the sum of the numbers on them is noted. Find the probability of getting each sum from $2$ to $9$ separately.

$A$ carton of $24$ bulbs contains $6$ defective bulbs. One bulb is drawn at random. What is the probability that the bulb is not defective? If the bulb selected is defective and it is not replaced, and a second bulb is selected at random from the rest, what is the probability that the second bulb is defective?