There are chits numbered $1$ to $20$ in a box. One chit is drawn at random. Find the probability that the number on the chit is a prime number.

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

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

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 not white.

$A$ card is drawn at random from a well-shuffled pack of $52$ cards. The probability that the card is not a picture card is ...........

If $P(A)$ denotes the probability of an event $A$,then