A number is chosen from first $100$ natural numbers. The probability that the number is even or divisible by $5$, is
$\frac{3}{4}$
$\frac{2}{3}$
$\frac{4}{5}$
$\frac{3}{5}$
Three coins are tossed once. Find the probability of getting $2$ heads
Two cards are drawn from a pack of $52$ cards. What is the probability that one of them is a queen and the other is an ace
Choose a number $n$ uniformly at random from the set $\{1,2, \ldots, 100\}$. Choose one of the first seven days of the year $2014$ at random and consider $n$ consecutive days starting from the chosen day. What is the probability that among the chosen $n$ days, the number of Sundays is different from the number of Mondays?
The probability that a teacher will give an unannounced test during any class meeting is $1/5$. If a student is absent twice, then the probability that the student will miss at least one test is
If $A$ and $B$ are mutually exclusive events, then the value of $P (A$ or $B$) is