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To solve question **4b (5)**, we need to evaluate the statement "{\{1\}} \subseteq A" for the set \( A = \{0, \{1\}, \emptyset, \{2,3\}\} \).

### Interpretation:
- The statement is about whether the set \(\{1\}\) (the set containing 1) is a subset of \( A \).
- A subset means that every element in \(\{1\}\) must also be an element in \( A \).

#### Check:
- The set \(\{1\}\) contains only one element, which is the number 1.
- Looking at the set \( A = \{0, \{1\}, \emptyset, \{2,3\}\} \), we see that \(\{1\}\) itself is an element of \( A \), but **1** is not an element of \( A \).

Thus, the set \(\{1\}\) is **not** a subset of \( A \), since 1 is not an element of \( A \).

### Conclusion:
The statement in **4b (5)**, "\(\{1\} \subseteq A\)," is **false**.

Would you like further details on subsets or any related questions?

### Related questions:
1. What is the difference between a subset and an element of a set?
2. Can an empty set be a subset of any set?
3. Is the set \(\{\{1\}\} \subseteq A\) true for this example?
4. How can we determine whether a set is a subset of another set in general?
5. What happens if we change the set \( A \) in this problem?

### Tip:
When evaluating whether a set is a subset of another, remember that each element of the subset must also be an element in the main set.

In this problem, you are tasked with determining whether the set {1} is a subset of A = {0, {1}, ∅, {2,3}}. Explore key concepts in set theory, including subsets and elements of sets. Suitable for students in Grades 9-12.

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