Question

which command is used to remove a slide from the presentation permanently

Answer 1

On the  Slide/ Outline task pane at left side

Select the slide you need to delete,JUST CLICK DELETE button on keyboard and it will get deleted 

OR

 right click this slide, and you will view the Delete Slide item in right-click menu.

Hope this helps!!!!!!

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Answer 2

E  is used to slide show  :erase annotation