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

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MS Excel
To create a formula, you first:

Choose the new command from the file menu
Select the cell you want to place the formula into
Type the equals sign (=) to tell Excel that you’re about to enter a formula
Enter the formula using any input values and the appropriate mathematical operators that make up your formula

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MS Excel
A circular reference is

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

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