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19. If you perform stemming on words in V to create V then |V| > | V|. True or false? 20. How are query likelihood

19. If you perform stemming on words in V to create V then |V| > | V|. True or false?

20. How are query likelihood and language models related?

21. If we add a new page to the web, what happens to other existing PageRank scores? Explain.

22. What is a forward web index used for?

23. In reality, high recall tends to be associated with low precision. Why?

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