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Engineering Interview in Technical Round: Design

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Engineering Interview in Technical Round: Design a four-input NAND gate using only two-input NAND gates.

Be technically right in answering the question. If the question is not clear then it is ideal to ask the interviewer(s) to repeat the question. If possible ask the permission of the interviewer(s) to let you explain the answer with the help of a diagram.
The answer to the question is to get an inverter, tie the inputs of a NAND Gate

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