MS Excel
The command Edit > Fill Across Worksheet is active only when

One sheet is selected
When many sheets are selected
None of the listed here
When no sheet is selected

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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

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

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MS Excel
To create a formula, you can use:

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

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