Martin Pena
09/10/2024 · Primary School
Let \( A=-\{x: x \in 7\} \)
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The expression \( A = -\{x: x \in 7\} \) seems to be a bit unclear, as it mixes set notation with a numerical value.
In set notation, \( \{x: x \in 7\} \) does not make sense because \( 7 \) is not a set; it is a single number. The notation \( \{x: x \in S\} \) is typically used to describe a set of elements \( x \) that belong to some set \( S \).
If you meant to define a set \( A \) in terms of a specific set of numbers or a condition, please clarify what you intended. For example, if you meant to define \( A \) as the set of all numbers \( x \) that are in a certain set, you would need to specify that set.
If you meant to express something else, please provide more context or correct the notation, and I'll be happy to help!
Quick Answer
The expression \( A = -\{x: x \in 7\} \) is unclear due to incorrect set notation.
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