To determine the SharePoint Server 2010 version installed in your system

Method 1: Using Power Shell:

1. Open the Start > SharePoint 2010 Management Shell

2. Type the cmdlets as follows

(get-spfarm).buildversion

This gives the output as follows

Method 2 : Using Central Administration:

1. Open SharePoint 2010 Central Administration > Upgrade and Migration

2. Open Check product and patch installation status under the Upgrade and Patch Management

This gives the output as follows

Method 3:

1.       Open SharePoint 2010 Central Administration > System Settings

2.       Click the link Manage servers in this farm under Servers section

3.       You will see the configuration database version