Final answer:
The sample space when you flip a coin once is {H, T}, where H represents heads and T represents tails. The possible outcomes are heads or tails.
Step-by-step explanation:
The sample space when you flip a coin once is {H, T}, where H represents heads and T represents tails. The possible outcomes are heads or tails. For example, if you toss a coin and it lands on heads, the outcome is H. If it lands on tails, the outcome is T. The sample space represents all possible outcomes of the coin flip.