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21. Calculate P(they play in a big garden) assuming a bi-gram language model.
1/8
1/12
1/24
None of the above
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22. Assume that you are using a bi-gram language model with add one smoothing. Calculate P(they play in a beautiful garden).
4.472 x 10-6
2.236 x 10-6
3.135 x 10-6
23. Which of the following are true? 1. Given a CFG and its corresponding CNF, they both produce the same language. 2. For a given grammar, there can be more than one CNF 3. It requires '2n+1' productions or steps in CNF to generate a string w of length 'n' 4. None of the above
1 and 2
2 and 3
3 and 4
1 and 4
24. Consider the CFG given below: S -> ASA | aB A -> B | s B -> b | ε How many non-terminals need to be added to convert the above grammar into CNF?
1
4
2
3
25. Which of the following are true with respect to a Top-Down and Bottom-Up Parser? 1. A Top-Down Parser never explores options that will not lead to a full parse. 2. A Bottom-Up Parser never explores options that will not lead to a full parse. 3. A Top-Down Parser never explores options that do not connect to the actual sentence. 4. A Bottom-Up Parser never explores options that do not connect to the actual sentence.
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