Explanation : S —> aB —> aaBB-->aabB —> aabb
So (b) is wrong. We have
S --> a B —> a b So (c) is wrong.
A careful observation of the productions will
reveal a similarity. Change A to B, B to A, a to b
and b to a. The new set of productions will be
the same as the original set. So (d) is false and
(a) is the correct answer.
Non-detenninism and NFA. DPDA and PDAs and Languages accepted by these Structures
Non- computability and Examples of non-computable problems
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