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Question
Which of the following collection are sets? Justify your answer:
The collection of all girls in your class.
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Solution
The collection of all girls in a class is a set, as it is well defined that all girls of the class are being talked about.
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4 _____ A
Let A = {1, 2, 3, 4, 5, 6}. Insert the appropriate symbol ∈ or ∉ in the blank space:
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