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Are ambiguous grammar context free?

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MCQ
1.
Consider the following context free languages:
L1 = {0^i 1^j 2^k | i+j = k}
L2 = {0^i 1^j 2^k | i = j or j = k}
L3 = {0^i 1^j  | i = 2j+1}
 Which of the following option is true?
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2.
Recursively enumerable languages are not closed under ______________
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3.
Consider 2 scenarios:
C1: For DFA (?, ?, ?, qo, F),
         if F = ?, then L = ?*
C2: For NFA (?, ?, ?, qo, F),
         if F = ?, then L = ?*
Where F = Final states set
? = Total states set
Choose the correct option ?
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4.
Production Rule: aAb->agb belongs to which of the following category?
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5.
Assume Statement S1 and S2 defined as:S1:L2-L1 is recursive enumerable Where L1 and L2 are recursive and recursive enumerable respectively. S2: The set of all Turnig machine is countable. Which of the following is true?
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