If a number is selected at random from one-digit natural numbers,the probability of that number being a multiple of $3$ is ..... .

Three unbiased coins are tossed simultaneously. Then,the probability of receiving at the most two tails is ........

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

If $I$ toss a coin $3$ times and get a head each time,should $I$ expect a tail to have a higher chance in the $4^{th}$ toss? Give a reason in support of your answer.

$A$ balanced die is rolled twice. Then,the probability of the sum of numbers received in these two trials being even is ...........

The probability of a non-leap year having $53$ Saturdays is .......