GATE | CS | 2014 | Set 3 | Discrete Mathematics | Logic | Question 56

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Consider the decision problem 2CNFSAT defined as follows:

GATECS2014Q55

NP-Complete.

solvable in polynomial time by reduction to directed graph reachability.

solvable in constant time since any input instance is satisfiable.

NP-hard, but not NP-complete.

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