Challenge

There is a building of 100 floors. If an egg drops from the Nth floor or above, it will break.

Some men are on an island. A genie comes down and gathers everyone to­gether and places a magical hat on some people’s heads.

How do we find the number of trailing zeros in a factorial?

In the context of milk bottle production, the Department of Public Health requires a random sample of k bottles from your factory.

You have a basketball hoop and someone says you can play 1 of 2 games.

There are three ants on different vertices of a triangle. What is the probability of colli­sion (between any two or all of them) if they start walking on the sides of the triangle?