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The Output is stuck at either '0' or '1'?

O/P Stuck at - '1': One input combination is enough (All 1's). So that output should transition from '1' to '0'.

O/P Stuck at - '0': 7 combinations possible (000, 001, 010, 100, 101, 110). But only one is enough. Output should transition from '0' to '1'.

So 2 input vectors necessary to verify the three input NAND gate stuck fault.

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Q: In order to find out stack fault of a three input NAND gate how many necessary input vectors are needed?
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