A bag contains $30$ balls numbered from $1$ to $30$, one ball is drawn randomly. The probability that number on the ball is multiple of $5$ or $7$ is
$\frac{1}{2}$
$\frac{1}{3}$
$\frac{2}{3}$
$\frac{1}{4}$
Three coins are tossed once. Find the probability of getting $2$ heads
The probability of a sure event is
A card is selected from a pack of $52$ cards. How many points are there in the sample space?
A die is thrown. Describe the following events : $A$ : a number less than $7.$ Find the $A \cup B$.
An experiment involves rolling a pair of dice and recording the numbers that come up. Describe the following events:
$A:$ the sum is greater than $8$,
$B : 2$ occurs on either die
$C:$ the sum is at least $ 7$ and a multiple of $3.$
Which pairs of these events are mutually exclusive ?