What is a challenge coin?

There are also coins made for special events, anniversaries and even nonmilitary leaders. Many service members and veterans proudly display challenge coins at their desks or homes, showing off the many missions they’ve been on, the top leaders they’ve met and the units for which they’ve worked. But how did this tradition get started?

How many faces does a coin have?

A coin has two faces (heads and tails), with a probability of 50% for each face, but what is the probability that is does not fall on any of it's faces but on it's edge? Usually, coins used in probability problems are only assumed to have two outcomes: heads or tails. The possibility of a coin landing on its side is ignored in most problems.

What does a military coin mean?

They’ve been an American military tradition for a century, meant to instill unit pride, improve esprit de corps and reward hard work and excellence. The coins represent anything from a small unit to the offices of top leaders, such as the defense secretary. There are also coins made for special events, anniversaries and even nonmilitary leaders.

What is the probability of getting two heads when flipping three coins?

So you have three possible outcomes. Three outcomes associated with event. Three outcomes satisfy this event, are associated with this event. So the probability of getting exactly two heads when flipping three coins is three outcomes satisfying this event over eight possible outcomes. So it is 3/8.