Total number of outcomes in the experiment of throwing a balanced die twice is ..........

The probability of the Sun setting in the west is $\ldots \ldots \ldots$

Two dice are thrown at the same time and the product of numbers appearing on them is noted. Find the probability that the product is less than $9$.

Two balanced dice are rolled. Find the probability that the sum of numbers on two dice is even.

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 greater than $9$?

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