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A formula.
A relative reference in a formula will change when it is copied.
You can use both numbers and cell references in formulas.
Relative cell references and some mixed cell references will change when a formula is copied.
relative cell address
Horizontal references in Excel refer to a method of referencing data in a row. This means that data is organized in rows and referenced using row numbers. Horizontal references allow you to use formulas to work with data across an entire row instead of just a single cell.
It can be a formula put into a cell. There are lots of variations, using numbers, dates, cell references and other things. Something simple like: =10+2 =A14-C12
It contains relative cell references.
It would be a formula that includes absolute references in cells. When such a formula is copied, those cell references will not change. An absolute cell reference includes cell references with two dollar signs in them, like: $A$2.
You can do this using relative reference.
There are several functions of Excel that do not work with 3D formulas. These include cell references and range formula.
In Excel an equation can be a formula. All formulas in Excel must start with the equals sign. That is what tells Excel it is a formula.