Exercise · ZW-SET-MEMBERSHIP-009 · ★★☆ Intermediate
Let \(C = \{\{1\}, \{2\}, \{3\}\}\). Which statement is true?
Choose one option.
Show answer
- A. \(\{1\} \in C\)
Explanation
The elements of C are the sets \(\{1\}\), \(\{2\}\) and \(\{3\}\). The number 1 is not an element of C, and neither are \(\{1,2\}\) nor \(\{1,2,3\}\).
Review the concept: Set membership
The relation stating that an object \(x\) is one of the elements of a set \(A\), symbolized by \(\in\).
\[x \in A\]
More practice problems: set membership
- ZW-SET-MEMBERSHIP-001 What does x ∈ A mean?
- ZW-SET-MEMBERSHIP-002 What is the negation of x ∈ A?
- ZW-SET-MEMBERSHIP-003 Let A = \1, 2, 3\. Which statement is true?
- ZW-SET-MEMBERSHIP-004 Let A = \∅, \1\\. Which statement is true?
- ZW-SET-MEMBERSHIP-005 Can a set contain the same element twice?
- ZW-SET-MEMBERSHIP-006 Which symbol expresses that x does not belong to A?
- ZW-SET-MEMBERSHIP-007 Let A = \∅, \∅\\. Which statement is true?
- ZW-SET-MEMBERSHIP-008 Let B = \1, \1\, \\1\\\. How many elements does B have?