There are two childrens in a family. The probability that both of them are boys is
$\frac{1}{2}$
$\frac{1}{3}$
$\frac{1}{4}$
None of these
A coin is tossed twice, what is the probability that atleast one tail occurs ?
Two dice are thrown. The events $A, B$ and $C$ are as follows:
$A:$ getting an even number on the first die.
$B:$ getting an odd number on the first die.
$C:$ getting the sum of the numbers on the dice $\leq 5$
Describe the events $A^{\prime }.$
A card is drawn from a well shuffled pack of cards. The probability of getting a queen of club or king of heart is
A fair coin with $1$ marked on one face and $6$ on the other and a fair die are both tossed. find the probability that the sum of numbers that turn up is $12$.
Three coins are tossed. Describe Three events which are mutually exclusive and exhaustive.