$A$ balanced die is thrown. Find the probability that the number on the die is even.

Two unbiased dice are thrown once. Write all the possible outcomes of this experiment. What is the probability that the sum of numbers on two dice is a prime number?

An unbiased coin is tossed thrice. Find the probability of the following event:
$A:$ Exactly $2$ heads are received.

$A$ school has five houses $A, B, C, D$ and $E$. $A$ class has $23$ students: $4$ from house $A$,$8$ from house $B$,$5$ from house $C$,$2$ from house $D$,and the rest from house $E$. $A$ single student is selected at random to be the class monitor. The probability that the selected student is not from house $A, B$,or $C$ is: (in $/23$)

Two balanced dice are rolled. Find the probability that the sum of numbers on two dice is a multiple of $6$.

Three unbiased coins are tossed simultaneously. Then,the probability of receiving at the most two tails is ........