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

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

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MS Excel
The auto calculate feature

Automatically creates formulas and adds them to a worksheet
Can only add values in a range of cells
Provides a quick way to view the result of an arithmetic operation on a range of cells
A and C

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