MS Excel
A circular reference is

Geometric modeling tool
A formula that either directly or indirectly depends on itself
A cell that points to a drawing object
Always erroneous

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MS Excel
When all the numbers between 0 and 100 in a range should be displayed in Red Color, apply

Select the cells that contain number between 0 and 100 then click Red color on Text Color tool
Use =if() function to format the required numbers red
Apply Conditional Formatting command on Format menu
All of above

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