From a class of $12$ girls and $18$ boys, two students are chosen randomly. What is the probability that both of them are girls
$\frac{{22}}{{145}}$
$\frac{{13}}{{15}}$
$\frac{1}{{18}}$
None of these
Three integers are chosen at random from the first $20$ integers. The probability that their product is even, is
Dialing a telephone number an old man forgets the last two digits remembering only that these are different dialled at random. The probability that the number is dialled correctly, is
In a certain lottery $10,000$ tickets are sold and ten equal prizes are awarded. What is the probability of not getting a prize if you buy $10$ ticket.
A bag contains $5$ white, $7$ black and $4$ red balls. Three balls are drawn from the bag at random. The probability that all the three balls are white, is
A bag contains $6$ red, $5$ white and $4$ black balls. Two balls are drawn. The probability that none of them is red, is