If Excel is not highlighting cells in the formula, enable 'Allow editing directly in cells' and 'Enable fill handle and cell drag-and-drop' in Excel options.

From now onwards, Excel will display the formula in all cells instead of the calculated results. Note: If you want to show the results again in all cells, you need to disable this setting.

However, Excel's random number functions are volatile, meaning they change constantly. In this article, I'll show you how to generate and fix random numbers and remove duplicates.