One number is selected at random from one-digit natural numbers. The probability of that number being even is $\ldots \ldots \ldots$

$A$ card is selected from a deck of $52$ cards. The probability of its being a red face card is

In a game,the entry fee is $Rs. 5$. The game consists of tossing a coin $3$ times. If one or two heads show,Sweta gets her entry fee back. If she throws $3$ heads,she receives double the entry fee. Otherwise,she will lose. For tossing a coin three times,find the probability that she:
$(i)$ loses the entry fee.
$(ii)$ gets double the entry fee.
$(iii)$ just gets her entry fee back.

The probability of an event $K$ satisfies ...............

The probability of the month of April of a leap year having $5$ Fridays is $\ldots \ldots \ldots$

Someone is asked to take a number from $1$ to $100$. The probability that it is a prime number is