College Math Placement Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

In set notation, how do you define the empty set?

{}

∅

The empty set is often best represented by the symbol ∅ in set notation. This symbol clearly signifies a set that contains no elements at all. It is a universally accepted notation in mathematics, making it an efficient way to denote the absence of members in a set.

While the curly braces {} can also signify an empty set, they are technically a notation that can imply an empty collection rather than specifically the set itself. The use of ∅ as a representation is more precise and widely recognized. The terms N/A and NULL do not correspond to standard mathematical terminology regarding sets; these terms may represent non-applicable states or null values in other contexts, but they do not denote the empty set in formal set theory.

Thus, choosing ∅ clearly identifies the empty set in a way that is precise and consistent with mathematical conventions.

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N/A

NULL

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