$A$ card is selected at random from a well-shuffled pack of $52$ cards. Find the probability that the selected card is the queen of hearts.

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 ball is either black or white.

If $P(A) : P(\overline{A}) = 4 : 1$,then $P(\overline{A}) = \ldots$

$A$ circle with radius $7 \, cm$ is drawn at the centre of a rectangle $28 \, cm$ long and $22 \, cm$ broad. Find the probability that a ball hitting the rectangle hits the circle.

$A$ card is drawn at random from a well-shuffled pack of $52$ cards. The probability that the card drawn is an ace of a red suit is ...........

An unbiased coin is tossed thrice. The probability of getting a tail all three times is ...........