Three coins are tossed once. Find the probability of getting at most $2$ heads.

$A$ man and a woman appear in an interview for two vacancies in the same post. The probability of the man's selection is $1/4$ and that of the woman's selection is $1/3$. What is the probability that none of them will be selected?

There are $3$ families,each having $1$ boy and $1$ girl. If one child is selected from each family,what are the elements of the event that only girls are selected?

If a leap year is selected at random,what is the chance that it will contain $53$ Tuesdays?

If one card is drawn at random from a pack of $52$ cards,what is the probability that it is a king or a queen (in $/13$)?

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