# Tails

## Probability Problems Involving Coins

When you toss a coin, the outcome can either be *head* or *tail*. If the coin is so balanced that these two outcomes are equally likely to occur, then the probability that the outcome is head is 1/2, and the probability that the outcome is tail is also 1/2.

**Example**

A coin is tossed three times. What is the probability that the head will appear only once?