The sum of two positive numbers is $100$. The probability that their product is greater than $1000$ is
$\frac{7}{9}$
$\frac{7}{{10}}$
$\frac{2}{5}$
None of these
Let Ajay will not appear in JEE exam with probability $\mathrm{p}=\frac{2}{7}$, while both Ajay and Vijay will appear in the exam with probability $\mathrm{q}=\frac{1}{5}$. Then the probability, that Ajay will appear in the exam and Vijay will not appear is :
A number is chosen at random from first ten natural numbers. The probability that number is odd and perfect square is
A bag contains $3$ red and $5$ black balls and a second bag contains $6$ red and $4$ black balls. A ball is drawn from each bag. The probability that one is red and other is black, is
On her vacations Veena visits four cities $(A,\,B ,\, C$ and $D$ ) in a random order. What is the probability that she visits $A$ before $B$ ?
Three coins are tossed once. Find the probability of getting atleast $2$ heads.