MS Excel
If you need to remove only the formatting done in a range (numbers and formula typed there should not be removed), you must

From Edit menu choose Clear and then Formats
From Edit menu choose Delete
Click on Remove Formatting tool on Standard Toolbar
Double click the Format Painter and then press Esc key in keyboard

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MS Excel
A circular reference is

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

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MS Excel
To save a workbook, you:

Click the save button on the standard toolbar from the menu
Press Ctrl+ F5
Click Save on the Windows Start button
Select Edit > Save

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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
Apply Conditional Formatting command on Format menu
All of above
Use =if() function to format the required numbers red

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