Question

which sign is used before the cell name to show the cell referencing?
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Answer 1

Answer:

Each cell reference contains one or more letters followed by a number. The letter or letters identify the column and the number represents the row. In a standard spreadsheet, the first column is A, the second column is B, the third column is C, etc.

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Answer 2

If you do not want cell references to change when you copy a formula, then make those cell references absolute cell references. Place a "$" before the column letter if you want that to always stay the same.