Q.

Which of the following pairs have DIFFERENT expressive power?

A. Deterministic finite automata (DFA) and Non-Deterministic finite automata(NFA)
B. Deterministic push down automata (DPDA) and Non-deterministic pushdown automata
C. Deterministic single-tape Turing machine and Non-deterministic single-tape Turing Machine
D. Single-tape Turing machine and multi-tape Turing machine
Answer» B. Deterministic push down automata (DPDA) and Non-deterministic pushdown automata
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