Answer:
a. HH HT TH TT
Explanation:
If a man flips a coin twice, he can get the following situations:
1. First coin head and second coin head
2. First coin head and second coin tail
3. First coin tail and second coin head
4. First coin tail and second coin tail
Therefore, if we represent heads by H and tails by T, the sample space of the possible outcomes is the representation of all the situations listed above. So, the answer is:
a.HH HT TH TT