The probability of choosing a vowel from the letters of the word $PROBABILITY$ is ........

Describe the sample space for the indicated experiment: $A$ coin is tossed four times.

If $A$ is a sure event,then the value of $P(\text{not } A)$ is:

Let $N$ denote the sum of the numbers obtained when two dice are rolled. If the probability that $2^{N} < N!$ is $\frac{m}{n}$,where $m$ and $n$ are coprime,then $4m - 3n$ is equal to $......$.

The probability of getting a number greater than $2$ in throwing a die is

$A$ box contains $10$ good items and $6$ defective items. If one item is selected at random,what is the probability that it is either good or defective?