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The World Wide Web (WWW) is the repository of large number of web pages which can be accessed via Internet by multiple users at the same time and therefore it is Ubiquitous in nature. The search engine is a key application used to search the web pages from this huge repository, which uses the link analysis for ranking the web pages without considering the facts provided by them. A new algorithm called Probability of Correctness of Facts (PCF)-Engine is proposed to find the accuracy of the facts provided by the web pages. It uses the Probability based SIMilarity function (SIM) which performs the string matching between the true facts and the facts of web pages to find their probability of correctness.
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