Two balanced dice are rolled. Find the probability that the sum of numbers on two dice is odd.

At a fete, cards bearing numbers $1$ to $1000$, one number on one card, are put in a box. Each player selects one card at random and that card is not replaced. If the selected card has a perfect square greater than $500$, the player wins a prize. What is the probability that:
$(i)$ the first player wins a prize?
$(ii)$ the second player wins a prize, if the first has won?

There are chits numbered $1$ to $20$ in a box. One chit is drawn at random. Find the probability that the number on the chit is a prime number.

$A$ balanced die is thrown once. Find the probability of getting a number greater than $4$.

$A$ card is selected at random from a well-shuffled pack of $52$ cards. Find the probability that the selected card is of a black suit.

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