When two dice are thrown,the probability of getting the sum of the values on them as $10$ or $11$ is

Four coins are tossed. The probability that at least one head turns up is:

The probability that a number selected at random from the set of numbers $(1, 2, 3, \ldots, 100)$ is a cube,is

Let $A$ be the event that the absolute difference between two randomly chosen real numbers in the sample space $[0, 60]$ is less than or equal to $a$. If $P(A) = \frac{11}{36}$,then $a$ is equal to $...............$.

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

If $A$ and $B$ are two events,what is the probability that exactly one of them occurs?