Final answer:
When the inputs to a 3-input NAND gate are 001, the output is 1.
Step-by-step explanation:
A NAND gate is a logic gate that produces an output of 0 if any of its inputs are 1, and an output of 1 only if all of its inputs are 0. In this case, the inputs to the 3-input NAND gate are 001, which means that only the last input is 1 while the first and second inputs are 0. According to the behavior of a NAND gate, the output would be 1 since all inputs are not 0.