The probability of the month of February in a non-leap year having $5$ Thursdays is ............

If $P(A) : P(\bar{A}) = 3 : 4$,then $P(A) =$ .........

If $P(C) = \frac{2}{5}$,then $P(\bar{C}) = \ldots \ldots \ldots$

$A$ balanced die is thrown once. Find the probability of getting a prime number.

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 $8$?

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 white or blue.