Delete photos in MacBook Pro

If duplicate photos are in series , leave the first photo and hold the shift key click on rest of duplicate photos to get selected .

Right click on any one of them and click on delete .

The photos will be deleted from the photo library of Mac and all other devices signed in with same Apple ID and password on the same network , as well on iCloud.com

• You can select consecutive items by holding down the Shift key while selecting them. You can select non-consecutive items by holding down the Command key while selecting them.

Select items on your Mac screen - Apple Support