That would depend on the formula. Zero as a result of a formula could be as a result of a calculation. On other occasions zero might be returned as a default value or when no other result is appropriate. You would really need to have details of the formula and the cells and values it references to know what it may mean in a certain context. Zero could also be a value used within a formula. Again it would depend on the context. Zero is often used in a function as an argument. The specific reason would be different in different functions.
If you mean doing calculations, then it is a formula.
=AVERAGE(Firstcell:lastcell) i think
If you mean in Excel, yes: you must always start a formula with an equal sign.
A green arrow in the corner of an excel cell means that excel suspects soemthing may be wrong with the formula in a particular cell.
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.
Since you put this question in the Excel category, I will respond with an Excel formula. Assuming you put your numbers in cells A1 through A100, the formula would be:=SUM(A1:A100)/100
There is no formula error button in Excel. However, there is an Error Checking button on the Formulas ribbon in the Formula Auditing section in Excel 2007.
Excel formulas begin with an equal sign, for example:=SUM(A1:A7)will give you the total of the numbers in cells A1, A2, A3, A4, A5, A6 and A7.Array formulas start with = but are enclosed in brace bracket{}.You can also use the plus or minus sign to start a formula, but as soon as you press Enter, a plus will be converted into an equals sign and a minus sign will have an equals sign inserted before it, so the formula will still show as starting with an equals sign.+5+7 will become =5+7-10*2 will become =-10*2Lotus 123 was the big spreadsheet application before Excel. It used the @ sign to start its functions. In order to help people moving from using Lotus 123 to Excel, the ability to start functions with the @ sign was included in Excel, and you can still do that. This applies only to functions at the start of a formula, not any formula.
The PVIFA formula in excel refers to Present Value Interest Factor of Annuity. This is able to be calculated in an excel document.
Replicating means copying. So replicating a formula in Excel is copying a formula. This is a very common activity that is done in Excel. You create one formula and then use it in other places on the worksheet.
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The formula bar.