In December 2001 a search using the Web search engine Google^TM for "Costenoble" yielded 10,000 Web sites containing that word. A search for "Waner" yielded 67,000 sites. A search for sites containing both words yielded 4,393 sites. How many Web sites contained either "Costenoble" or "Waner" or both ? A)14,393 B) 72,607 C) 81,393 D) 77,000 E) 71,393

Question

Quizplus · Accepted Answer

To find the total number of websites containing either "Costenoble" or "Waner" or both, we use the principle of inclusion-exclusion. We add the total number of sites for each word and subtract the number of sites that contain both words to avoid double-counting. So, $10,000 + 67,000 - 4,393 = 72,607$.

In December 2001 a Search Using the Web Search Engine