A card is drawn from a well shuffled pack of cards. The probability of getting a queen of club or king of heart is
$\frac{1}{{52}}$
$\frac{1}{{26}}$
$\frac{1}{{18}}$
None of these
The probabilities of a student getting $I, II$ and $III$ division in an examination are respectively $\frac{1}{{10}},\,\frac{3}{5}$ and $\frac{1}{4}.$ The probability that the student fails in the examination is
A bag $x$ contains $3$ white balls and $2$ black balls and another bag $y$ contains $2$ white balls and $4$ black balls. A bag and a ball out of it are picked at random. The probability that the ball is white, is
From a book containing $100$ pages, one page is selected randomly. The probability that the sum of the digits of the page number of the selected page is $11$, is
Two dice are thrown simultaneously. The probability of getting the sum $2$ or $8$ or $12$ is
Describe the sample space for the indicated experiment: A coin is tossed and then a die is rolled only in case a head is shown on the coin.