Write all possible outcomes, when:
a coin is tossed two times or two coins are tossed together once.

Answer

To solve the problem of finding all possible outcomes when a coin is tossed two times or two coins are tossed together once, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Outcomes for a Single Coin Toss**:
- When a single coin is tossed, there are two possible outcomes: Heads (H) or Tails (T).

2. **Determine Outcomes for Two Tosses**:
- When a coin is tossed two times, we can represent the outcomes as follows:
- First toss can be H or T.
- Second toss can also be H or T.
- Therefore, we can list the combinations of outcomes for two tosses:
- HH (First toss: H, Second toss: H)
- HT (First toss: H, Second toss: T)
- TH (First toss: T, Second toss: H)
- TT (First toss: T, Second toss: T)

3. **List All Possible Outcomes**:
- The complete list of possible outcomes when a coin is tossed two times (or two coins are tossed together) is:
- HH
- HT
- TH
- TT

### Final Answer:
The possible outcomes when a coin is tossed two times or two coins are tossed together once are:
- HH
- HT
- TH
- TT