{3,5}___A

Answer

To solve the question, we need to determine whether the set {3, 5} belongs to the set A, which contains the elements {1, 3, 5, 7, 9}.

### Step-by-Step Solution:

1. **Identify the Set A**:
The set A is given as A = {1, 3, 5, 7, 9}.

2. **Identify the Subset**:
We are given the subset {3, 5}.

3. **Check Membership**:
We need to check if the elements of the subset {3, 5} are present in set A.
- The first element is 3, which is present in A.
- The second element is 5, which is also present in A.

4. **Conclusion**:
Since both elements of the subset {3, 5} are found in set A, we can conclude that {3, 5} belongs to A.

5. **Final Answer**:
Therefore, the appropriate symbol to insert in the blank is "∈" (belongs to). The complete statement is: {3, 5} ∈ A.