Final answer:
To define a print area in Excel, select cells A1 through M17, go to the 'Page Layout' tab, and choose 'Set Print Area' from the 'Print Area' dropdown in the 'Page Setup' group.
Step-by-step explanation:
To set the print area in an Excel worksheet to cells A1 through M17, you should first select the range of cells you want to print, which is A1 through M17 in this case.
With the range selected, go to the 'Page Layout' tab in the Excel ribbon, and then click on the 'Print Area' button in the 'Page Setup' group. From the dropdown menu, select 'Set Print Area'. This action will define the selected range as the specific area of the worksheet to be printed. Remember, setting a print area is useful when you want to print only a specific part of your worksheet.