Two fair coins are tossed. What is the probability of getting exactly one head?

Step 1: List the sample space.

When two coins are tossed, the possible outcomes are:
HH, HT, TH, TT

There are 4 equally likely outcomes.

Step 2: Identify the outcomes with exactly one head.

HT contains exactly one head.
TH contains exactly one head.

So there are 2 favorable outcomes.

Step 3: Calculate the probability.

P(exactly one head) = 2 / 4

Step 4: Simplify.

2 / 4 = 1 / 2

Therefore, the probability of getting exactly one head is 1/2.