What John said, but if you are doing it with code, here are some options:
ActivePresentation.Slides(2).Delete
This will delete slide 2. But be careful because the rest of your slides
will be renumberd, so if you know the numbers delete from the end to the
front. That is, in your example, delete slide 20 then slide 10 then slide
3, etc.
Another option is to hide the slides (order shouldn't matter for this
one) so they won't show, but they will still be there.
ActivePresentation.Slides(2).SlideShowTransition.Hidden = msoTrue
hides slide 2.
Finally, you might want to create a custom show (either with or without
code) so all the slides are there, but you can play the show you want
that contains only the slides you want.
--David
--
David M. Marcovitz
Microsoft PowerPoint MVP
Director of Graduate Programs in Educational Technology
Loyola College in Maryland
Author of _Powerful PowerPoint for Educators_
http://www.PowerfulPowerPoint.com/