If $P(A) = 0.54$,then $P(\overline{A}) = \ldots$

Two dice are thrown simultaneously. What is the probability that the sum of the numbers appearing on the dice is
$(i)$ $7 ?$
$(ii)$ a prime number?
$(iii)$ $1 ?$

There are $5$ white,$7$ red,$4$ black and $2$ blue identical balls in a box. One ball is selected at random from the box. Find the probability that the selected ball is either red or black. (in $/18$)

Two balanced dice are rolled. Find the probability that the numbers on two dice are equal.

Two balanced dice are rolled simultaneously. Then,the probability that the sum of numbers on the dice is $12$ is ........

In any situation that has only two possible outcomes,each outcome will have a probability of $\frac{1}{2}$. True or false? Why?