1.Download and Install Samsung USB Driver and Rooting Package

2.Shut Down the Tab

3.Boot In Download Mode By Pressing Power And Volume Down

4.Open Odin 1.85 And Select PDA As "CF-Auto-Root-espressorf-espressorfxx-gtp3100.tar"And Make Sure That F.RESET And Auto Boot Is Tick Marked

5.Go To Settings-Developer Options-Tick Mark USB Debugging, Then Connect The Tab To Computer And You Will See Yellow Colour On Port

6.Select Start

7.Wait Till It Shows Pass

8.Download SuperSu From Play Store And Update Binary

Note : Don't Try this on models other than  P3100

Samsung USB Drivers

Rooting Package