$A$ coin is tossed $3$ times. The probability of obtaining at least two heads is

The probability of obtaining an even prime number on each die,when a pair of dice is rolled,is . . . . . . .

$A$ coin is tossed. If the outcome is a head,a die is thrown. If the die shows up an even number,the die is thrown again. What is the sample space for the experiment?

Three identical dice are rolled. The probability that the same number will appear on each of them is:

If $P(A \cup B)=0.8$ and $P(A \cap B)=0.3$, then $P(A^C)+P(B^C)$ is equal to

$A$ set $S$ contains $7$ elements. $A$ non-empty subset $A$ of $S$ and an element $x$ of $S$ are chosen at random. Then the probability that $x \in A$ is