Question 394 of 480
What defines a proper subset A ⊂ B?
- A and B are equal.
- All elements of A are in B, and B has at least one element not in A.
- All elements of B are in A.
- A and B have no common elements.
Correct Answer:
B
Explanation
A is a proper subset of B if A ⊆ B but A ≠ B. This means B contains all elements of A plus at least one extra.