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Q.
Production Rule: aAb->agb belongs to which of the following category?

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Which of the following pairs have DIFFERENT expressive power?
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The minimum number of productions required to produce a language consisting of palindrome strings over ?={a,b} is
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Push down automata excepts which language ?
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4.
Consider the following grammars G1 and G2 respectively. Grammar - G1:

A1 ? A2A3
A2 ? A3A1 | b
A3 ? A1A1 | a
Grammar - G2:

S ? AA | 0
A ? SS | 1
Consider the following statements regarding above grammars: (I): This grammar is not left recursive and equivalent to grammar - G1:

A1 ? A2A3
A2 ?  A3A1 | b
A3 ? a | bA3A1 | aK | bA3A1K 
k ? A1A3A1 | A1A3A1K
(II): This grammar is not left recursive and equivalent to grammar - G2:

S ? A A | 0
A ? 0S | 1 | 0SK | 1K
K ? AS | ASK
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5.
Which of these does not belong to CFG ?
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