Three unbiased coins are tossed. Then,the probability of getting at most two heads is

When two dice are thrown,what is the probability of getting a sum of $7$ (in $/36$)?

Describe the sample space for the indicated experiment: $A$ coin is tossed three times.

Each of the two boxes $A$ and $B$ contain $10$ chits numbered $1$ to $10$. If one chit is drawn at random from each of $A$ and $B$,then the probability that the number on the chit drawn from $A$ is smaller than the number on the chit drawn from $B$,is

Thirty-two persons $X_1, X_2, \ldots, X_{32}$ are randomly seated around a circular table at equal intervals. Two persons $X_i$ and $X_j$ are said to be within earshot of each other if there are at most three persons between them on the minor arc joining $X_i$ and $X_j$. The probability that $X_1$ and $X_3$ are within earshot of each other is:

If two integers are chosen at random,what is the probability that their product is an even integer?