i had tried to find this font in many web pages but couldn't find the exact font.So please can somebody help me to find this font.
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This font called Cuprum. It is available for free from Google fonts
In the future, give this tool a shot (http://www.myfonts.com/WhatTheFont/) it's been helpful time and time again for font matching. I would say it's more-or-less 90% accurate.