MS Excel
To create a formula, you can use:

Values or cell references although not both at the same time
Cell references but not values
Values but not cell references
Value and cell references

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

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