There are $5$ white,$7$ red,$4$ black and $2$ blue identical balls in a box. One ball is selected at random from the box. Find the probability that the selected ball is neither white nor black.

One number is selected at random from one-digit natural numbers. The probability of that number being even is $\ldots \ldots \ldots$

$A$ balanced die is rolled twice. Then,the probability of the event that an even number is received both the times is ..........

The probability of the month of February of a non-leap year having $5$ Wednesdays is ...... .

$A$ carton contains $100$ trousers of which $73$ are good,$12$ have minor defects and $15$ have major defects. Manu rejects only those trousers which have major defects. One trouser is selected at random from the carton. Then,the probability that the selected trouser is accepted by Manu is $\ldots \ldots \ldots \ldots .$

The probability expressed as a percentage of a particular occurrence can never be