A ? B means that A is a ___________ of BQuestion 3Answera.subsetb.unit matrixc.Euler circuitd.Disjoint

To solve the question "A ? B means that A is a ___________ of B," we need to analyze the given options:

1. Subset: In set theory, if $A \subseteq B$, it means every element of set A is also an element of set B. This fits the description "A is a ___________ of B."

2. Unit Matrix: This term relates to linear algebra and refers to a square matrix with ones on the diagonal and zeros elsewhere. It does not apply to the relationship between two sets.

3. Euler Circuit: This refers to a trail in a graph that visits every edge exactly once and returns to the starting vertex. While important in graph theory, it does not describe a relationship between two sets.

4. Disjoint: Two sets A and B are disjoint if they have no elements in common, meaning $A \cap B = \emptyset$. This does convey a specific relationship but is not what the question is directly asking for.

Final Answer

The most appropriate answer is a. subset, as it accurately describes the relationship between two sets where A is contained within B.