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Question
Let A = {{1, 2, 3}, {4, 5}, {6, 7, 8}}. Determine which of the following is true or false:
\[\left\{ 1, 2, 3 \right\} \subset A\]
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Solution
False
The correct form would be\[\left\{ 1, 2, 3 \right\} \in A \text{ or } {\left\{ 1, 2, 3 \right\}} \subset A\]
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