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I need help and explain when to use open circle or close circle

I need help and explain when to use open circle or close circle-example-1
User Mavrik
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You use the closed circle whenever the inequality sign has a line going underneath it meaning that it is less than or equal to or greater than or equal too. You use the open circle when there is no line meaning it's just less than or greater than. Does this help at all?
User Paul Sham
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