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

$A$ problem in Mathematics is given to three students $A, B, C$ and their respective probabilities of solving the problem are $\frac{1}{2}, \frac{1}{3},$ and $\frac{1}{4}$. What is the probability that the problem is solved?

The probability that a teacher will give an unannounced test during any class meeting is $1/5$. If a student is absent twice,then the probability that the student will miss at least one test is

What is the probability of getting a doublet when two dice are thrown?

If two dice are thrown simultaneously,then the probability that $1$ comes on the first die is

Three coins are tossed. Describe two events which are mutually exclusive.