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I'm a new comer, even in Math. I need hands for this (simple, may be for most people) question:

Can a subset of Rational Number Set be open (and closed)? If does, how can it be? If not,why?

thks!

Ka Yan

Can a subset of Rational Number Set be open (and closed)? If does, how can it be? If not,why?

thks!

Ka Yan

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