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

Two dice,one blue and one grey,are thrown at the same time. Write down all the possible outcomes. What is the probability that the sum of the two numbers appearing on the top of the dice is
$(i)$ $8 ?$
$(ii)$ $13 ?$
$(iii)$ less than or equal to $12 ?$

Two dice are thrown at the same time and the product of numbers appearing on them is noted. Find the probability that the product is less than $9$.

Two balanced dice are rolled simultaneously. Then,the probability that the sum of numbers on the dice is $11$ is .........

$A$ letter of English alphabets is chosen at random. Determine the probability that the letter is a consonant.

The probability of an event $K$ satisfies ...............