If a number is selected at random from one-digit natural numbers,the probability of that number being a multiple of $3$ is ..... .

The probability of any event cannot be ..........

When a balanced die is rolled,the probability of getting a multiple of $3$ on it is $\ldots \ldots \ldots .$

There are boards numbered $1$ to $50$ in a box. One board is selected at random. Find the probability that the number on the board is a multiple of $11$. (in $/25$)

The probability of the month of February of a leap year having $5$ Tuesdays is ..... .

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.