Hello bala,
I am sorry to bear you with bad news but you are using a very old version.
You can use an SEO extension to eliminate all the double content generated from Joomla!'s router but you have to look for one that is compatible with that version of K2.
If you upgrade your K2 installation you can also use K2's advanced SEF features.
JoomlaWorks Support Team
---
Please search the forum before posting a new topic :)