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2014-07-03T17:46:03+08:00

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A null set may be represented by { }  or  Ø
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2014-07-03T19:08:36+08:00

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Th e null sign is """ 0/"" my answer is that because there is no sign in the keyboard.,,,,,,,,,,……… You can draw zero then put a slash at the center of zero
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