Install the Remove Duplicates add-on from the Google Workspace Marketplace. In your sheet, click Extensions, then Remove Duplicates, and choose: Find Duplicates or Uniques.

To add a formula in Google Sheets, click the cell where you want the answer, then choose one of the hundreds of functions.

Google has started rolling out Google Sheets Formula Suggestions which automatically suggests formulas based on the entered data, Here's how you can use them.