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When all the inputs of a NAND gate are connected together, the resulting circuit is:

1. a NOT gate
2. an AND gate
3. an OR gate
4. a NOR gate

Correct answer: a NOT gate

Solution

A NAND gate outputs the negation of the AND of its inputs. If all inputs are tied together to one signal A, the output becomes ¬(A·A), which simplifies to ¬A. That is exactly the behavior of a NOT gate.

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