From the word `$POSSESSIVE$', a letter is chosen at random. The probability of it to be $S$ is
$\frac{3}{{10}}$
$\frac{4}{{10}}$
$\frac{3}{6}$
$\frac{4}{6}$
(b) It is obvious.
There are $n$ letters and $n$ addressed envelopes. The probability that all the letters are not kept in the right envelope, is
In each of the following experiments specify appropriate sample space A person is noting down the number of accidents along a busy highway during a year.
A die has two faces each with number $^{\prime}1^{\prime}$ , three faces each with number $^{\prime}2^{\prime}$ and one face with number $^{\prime}3^{\prime}$. If die is rolled once, determine $P(1$ or $3)$
A die is thrown. Describe the following events : $A$ : a number less than $7.$ Find the $A \cup B$.
In a single throw of two dice, the probability of obtaining a total of $7$ or $9$, is
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