The union of two sets contains which elements?
AElements in at least one set
BElements in both sets only
CElements in neither set
DElements outside both sets
Answer & Solution
Correct answer: A. Elements in at least one set
1. The union of two sets is written with the word or in ordinary language.
2. It is a new set containing all of the elements that are in at least one of the two sets.
3. Elements that happen to be in both sets are included as well.
4. Elements that lie in both sets and nowhere else make up the intersection, which is the smaller set.
_Source: Siyavula Mathematics Grade 10 (Everything Maths, CC BY 4.0), Chapter 14: Probability_
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