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All are deterministic CFL

See, if your problem can be defined by using one condition completely then your problem can be solved by using PDA. In the above problems all are can be defined just by using one condition. 

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A) S -> aSb / b

B) S -> aSb /a

C) S -> aSbb /E

D) option D is same as A just solving the equation 

   

  

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suneetha asked Dec 22, 2018
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i thought that it is the language where both start and end symbols are same and i got 65 but the ans is 29