As you begin to type PRODUCT the function shows itself and the explanation of it in the tooltip box. To switch between viewing the results and viewing the formulas that. The result is that all the numbers are multiplied by 15.
This process activates all the functions or formulas of excel.
By using this formula you can perform a specific set of calculations in a cell column or row. The concept is simple enough. In this example we multiply values in row 1 by the values. Type into the cell.