B Baron Junior Member Joined Oct 3, 2010 Messages 73 Jan 29, 2014 #1 The attachment has both the question and the solution. The part I'm confused about is the last line how pr = (n - r)pn-1 I'm guessing it is some algebraic manipulations but I don't know what. Attachments download.jpg 114.1 KB · Views: 6
The attachment has both the question and the solution. The part I'm confused about is the last line how pr = (n - r)pn-1 I'm guessing it is some algebraic manipulations but I don't know what.
