Correct Answer:
A. .=SUM(A1)
In Excel, the fundamental formula to add numbers is =SUM(). This function is designed to calculate the total of a range of cells or individual numbers. For example, =SUM(A1:A10) adds all numbers from cell A1 to A10.
- Options like =ADD() and =PLUS() are not valid built-in functions in Excel for performing summation.
- All Excel formulas must begin with an equals sign (=).
- Therefore, None of these is incorrect as =SUM(A1) (or a similar SUM usage) is the correct approach.